QNT 561 Final Exam Guide (New) For more course tutorials visit www.qnt561.com 1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon. 2.
What conditions must n satisfy to make the x2 test valid?
3. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples? 4. Studies of managers from two countries in the 1970s found sharp differences of opinion toward quality management. To find out if these differences continue to exist, researchers surveyed 100 managers in each country in the electronics manufacturing industry. The accompanying table gives the percentages of managers from each country who agree with each of 10 randomly selected statements regarding quality. Complete parts a through c. 5.
Consider the horizandal box plot shown to the right.
6. A random sample of 100 observations from a population with standard deviation 58 yielded a sample mean 111. Complete parts a through c. 7. Graph the relative frequency histogram for the 300 measurements summarized in the relative frequency table to the right. 8. Each month interviewrs visit about 69,000 of the 93 million households in the region and question the occupants over 18 years of age
about their educational status. Their responses enable the interviewers to estimate the percentage of people in the labor force who are college educated. Complete parts a through c. 9. School bullying is a form of aggressive behaviour that occurs when a student repeatedly to nagative actions from another student. In oredr to study the effectiveness of an antibullying policy at elementary schools, a survey of over 2,000 elementary school children was conducted. Each student was asked if he or she ever bullied another student. In a sample of 1358 boys, 745 claimed they had never bullied another student. In a sample of 1379 girls, 966 claimed they had never bullied another student. Complete parts a through f below. 10. A study analyzes recent incidents involving terrorist attcks. Data on the number of individual suicide bombings that occurred in each of 20 sampled terrorist group attacks against a country is reproduced in the data table below. An EXCEL/DXL printout is shown to the right. Complete parts a through e. 11. Educators are constantly evaluating the efficacy of public schools in the education and training of students. One quantitative assessment of change over time is the difference in scores on the SAT. The table below contains the average SAT scores for the years 1988 and 2005. 12. Each child in a sample of 62 low-income was administrated a language and communication exam. The sentence complexity scores had a mean of 7.63 and a standard deviation of 8.92. Complete parts a through d. 13. Suppose a consumer group rated 49 brands of toothpaste based on whether or not the brand carries an American Dental Association (ADA) seal verifying effective decay prevetion. The results of a hypothesis test
for the proportion of brands with the seal are shown to the right. Complete parts a through c. 14. A university conducted a study on 446 business graduates who had all completed the same business course. The study used correlation coefficients to investigate the relationship between many different business skills. Two of the many variable measured were selfknowledge skill level (x) and goalsetting ability (y). The correlation coefficient was r = 0.82. Complete parts a through c below. 15. Reference from the doc file of mentioned r value 16. Five banks have been ranked by the amount charged to credit and debit cards issued by the banks. The table to the right gives the total amount charged in 2007 for the top ranked banks. 17. Which hypothesis, the null or the alternative, is the status-quo hypothesis? 18. A study was done to examine whether the perception of service quality at hotels differd by gender. Hotel guests were randomly selected to rate service items on a 5-point scale. The sum of the items for each guest was determined and a summary of the guest scores are provided in the table. Complete parts a and b. 19. Identify the problem(s) in the residual plots shown below. 20. A university economist conducted a study of elementary school llunch menus. During the state-mandated testing period, school lunches averaged 873 calories. The economist claimed that after the testing period ended, the average caloric content of the school lunches increased significantly. Set up the null and alternative hypothesis to test the economist’s claim.
21. Compare the z-scores to decide which of the x values below lie the greatest distance above the mean and the greatest distance below the mean. 22. In one university, language professors incorporated a 10-week extensive reading program to improve students’ Japanese reading comprehension. The professors collected 283 books written for Japanese children and required their students to read at least 40 of them as part of the grade in the course. The books were categorized into reading levels (color-coded for easy selection) according to length and complexity. Complete parts a through c. 23. Researchers investigated the effect of tablet surface area to volume on the rate at which a drug is released in a controlled-release dosage. For six similarly shaped tablets with different weights and thicknesses, the diffusional drug release rate (percentage of drug released divided by the square root of time) was determined. The experimental data are listed in the table. Complete parts a through d. 24. To determine if winning a certain award leads to a change in life expectancy, researchers sampled 748 award winners and matched each one with another person of the same sex who was in the same profession and was born in the same era. The lifespan of each pair was compared. Complete parts a through c below. 25. Many entrepreneurs have donated money to various causes. Data on the total amount pledged and remaining net worth for the 10 top donors are given in the table. Complete parts a through d. 26. When planning for a new forest road to be used for tree harvesting, planners must select the location to minimize tractor skidding distance. The skidding distances (in meters) were measured at 20 randomly selected road sites. The data are given below. A logger working on the
road claims the mean skidding distance is atleast 413 meters. Is there sufficient evidence to refute this claim? Use Îą = 0.10. 27. Consider the pairs of measurements shown to the right. 28. For the Îą and observed significance level (p-value) pair, indicate whether the null hypothesis would be rejected. 29. Researchers conducted a survey of a representative sample of over 1,000 drivers. Based on how often each driver engaged in road rage behaviour, a road score was given. The drivers were also grouped by annual income. The data were subjected to an analysis of variance, with the results summarized in the table. There has been a recent trend for sports franchises in baseball, football, basketball and hockey to build new stadiums and ballparks in urban, downtown venues. A magazine investigated whether there has been a significant suburban-to-urban shift in the location of major sport facilities. In 1985 40% of all major sports facilities were located downtown, 30% in central city, and 30% in suburban areas. In contrast, of the 122 major sports franchises that existed in 1997, 65 were built downtown 28 in a central city, and 29 in a suburban area. Complete parts a through e. ---------------------------------------------------
QNT 561 Final Guide (Latest)
For more course tutorials visit www.qnt561.com
1. A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Assume the null hypothesis indicates a two-tailed test and the researcher decided to use the 0.10 significance level. For what values of t will the null hypothesis not be rejected? 2. Which of the following is a characteristic of the F distribution? 3. For a chi-square test involving a contingency table, suppose the null hypothesis is rejected. We conclude that the two variables are __________. 4. A sales manager for an advertising agency believes that there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned. What is the dependent variable? 5. Which of the following is most appropriately displayed with a frequency table? 6. The manager of Paul's fruit and vegetable store is considering the purchase of a new seedless watermelon from a wholesale distributor. Since this seedless watermelon costs $4, will sell for $7, and is highly perishable, he only expects to sell between six and nine of them. What is the opportunity loss for purchasing nine watermelons when the demand is for seven watermelons? a)
8
b)
4
c)
12
d)
0
7. A firm offers routine physical examinations as part of a health service program for its employees. The exams showed that 8% of the employees
needed corrective shoes, 15% needed major dental work, and 3% needed both corrective shoes and major dental work. What is the probability that an employee selected at random will need either corrective shoes or major dental work? a)
.25
b)
1.00
c)
.50
d)
.20
8. When data is collected using a qualitative, nominal variable, what is true about a frequency distribution that summarizes the data? a)
The upper and lower class limits must be calculated.
b)
The number of classes is equal to the number of variables plus 2.
c)
The “5 to the k rule� can be applied.
d)
A pie chart can be used to summarize the data.
9. If an ANOVA test is conducted and the null hypothesis is rejected, what does this indicate? a)
The p-value is less than a.
b)
All population means are different.
c)
At least one pair of population means is different.
d)
The population means are equal.
10. A random sample of 20 items is selected from a population. When computing a confidence interval for the population mean, what number
of degrees of freedom should be used to determine the appropriate tvalue? a)
25
b)
21
c)
19
d)
20
11. The question, "Should products be withdrawn if even one death is associated with its prescribed use, even if no fault for the tampered product accrues to the manufacturer?" is an example of a(n) _____. a)
strip data mining issue
b)
unresearchable question
c)
ill-defined problem
d)
favored-technique problem
12. A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa, and Discover. Six MasterCard sales, seven Visa, and five Discover sales were recorded. The store used an ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic? a)
2 in the numerator, 15 in the denominator
b)
6 in the numerator, 15 in the denominator
c)
18 in the numerator, 3 in the denominator
d)
3 in the numerator, 18 in the denominator
13. A linear trend equation is used to represent time series values when the data are changing by equal what? a)
amounts
b)
percents and proportions
c)
proportions
d)
percents
14. Which of the following goals should a good survey instrument accomplish? a)
Encourage each participant to provide accurate responses
b)
Encourage participants to be succinct in their responses
c) Encourage participants to answer only those questions they are comfortable answering d) Encourage participants to end the survey when they feel they have contributed enough information 15. Kroger, a grocery store chain, wants to identify the ideal store layout for increasing store sales. Because it primarily uses two store designs, one a grid layout with vertical aisles divided by a center aisle and another using a traditional straight-aisle pattern, Kroger will match pairs of stores that have different designs but similar shopper demographics and location. Sales from each pair will then be compared to determine if store design is related to sales. Which type of study is this an example of? a)
Exploratory study
b)
Case study
c)
Ex post facto study
d)
Longitudinal study
16. Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes and the standard deviation of this distribution is 14 minutes. Suppose 100 returns from this year are selected and analyzed regarding the preparation time. What assumption do you need to make about the shape of the population distribution of all possible tax preparation times to make inferences about the mean time to complete a tax form? a)
The population distribution is skewed to the left.
b)
The population distribution is skewed to the right.
c)
The shape of the population distribution does not matter.
d)
The population distribution is normal.
17. Checklists with several items to be considered by respondents may be subject to _____. a)
recency effects
b)
leniency effects
c)
halo effects
d)
primacy effects
18. In a multiple rating list scale, ____. a)
participants rate multiple items on a 3-point scale
b)
the participant is restricted to circling their rating
c) it is possible to visualize the results better than with other numerical scales d)
the data generated are always ordinal
19. As the size of the sample increases, what happens to the shape of the distribution of sample means? a)
It cannot be predicted in advance
b)
It is positively skewed
c)
It is negatively skewed
d)
It approaches a normal distribution
20. For any chi-square goodness-of-fit test, the number of degrees of freedom is found by ______. a)
n+k
b)
k -1
c)
n–k-1
d)
n+1
21. BankChoice is concerned about stagnating profits and asks, "How can profitability be improved?" This is an example of a(n) _____. a)
research question
b)
measurement question
c)
management question
d)
investigative question
22. A machine is set to fill the small-size packages of M&M candies with 56 candies per bag. A sample revealed three bags of 56, two bags of 57, one bag of 55, and two bags of 58. To test the hypothesis that the mean candies per bag is 56, how many degrees of freedom are there? a)
1
b)
7
c)
9
d)
8
23. An experimental study is one that _____. a) attempts to reveal why or how one variable produces changes in another b) involves manipulation of one or more variables to determine the effet on another variable c) attempts to capture a population's characteristics by making inferences from a sample's characteristics and testing resulting hypotheses d) discovers answers to the questions who, what, when, where, or how much 24. The monthly salaries of a sample of 100 employees were rounded to the nearest $10. They ranged from a low of $1,040 to a high of $1,720. If we want to condense the data into seven classes, what is the most convenient class interval? a)
$200
b)
$50
c)
$150
d)
$100
25. Consider a regression analysis, where the correlation coefficient is 0.18. Then, the coefficient of determination is _______. a)
.0324
b)
.36
c)
1.16
d)
.424
26. In multiple regression analysis, when the independent variables are highly correlated, this situation is called __________________. a)
homoscedasticity
b)
curvilinearity
c)
multicollinearity
d)
autocorrelation
27. Sam's Club installed self-checkout stations that can track not only member's purchases but also packaging problems, as the system uses universal product codes to match the item the shopper has in their cart with its price and inventory level in the store, generating a spreadsheet style report for the researcher. If you consider the scanner as the tool for collecting data for Sam's researchers, they are doing data entry by ____. a)
spreadsheet
b)
Optical Character Recognition
c)
Field editing
d)
Voice recognition
28. The weekly incomes of a large group of executives are normally distributed with a mean of $2,000 and a standard deviation of $100. What is the z-score for an income of $2,100? a)
1.683
b)
0.90
c)
2.00
d)
1.00
29. A ranking scale is a scale that _____. a) object
scores an object without making a direct comparison to another
b)
groups participants
c)
groups concepts according to specific criteria
d) scores an object by making a comparison and determining order among two or more objects 30. What is the interpretation of a 96% confidence level? a)
The interval contains 96% of all sample means.
b) Approximately 96 out of 100 such intervals would include the true value of the population parameter. c) There's a 96% chance that the given interval includes the true value of the population parameter.
d) There's a 4% chance that the given interval does not include the true value of the population parameter. ---------------------------------------------------
QNT 561 Week 1 DQ 1 For more course tutorials visit www.qnt561.com How may variance and standard deviation be applied to a real-world business-related problem? Provide a specific application in which these measures are useful. ---------------------------------------------------
QNT 561 Week 1 DQ 2 For more course tutorials visit www.qnt561.com When would you use Chebyshev’s theorem and the empirical rule in business? How are they calculated? Provide one real-life example that requires Chebyshev’s theorem and one that requires the empirical rule. ---------------------------------------------------
QNT 561 Week 1 Individual My Statslab Problem Set For more course tutorials visit
www.qnt561.com 1.
What is statistics?
2.
Explain the difference between descriptive and inferential statistics.
3.
Explain the difference between qualitative and quantitative data.
4.
Explain how populations and variables differ.
5.
Explain how populations and samples differ.
6.
What is a representative sample?
7.
Explain the difference between a population and a process.
8.
Define statistical thinking.
9. Suppose you’re given a data set that classifies each sample unit into one of four categories: A, B, C or D. You plan to create a computer database consisting of these data, and you decide to code the data as A = 1, B = 2, C = 3 and D = 4. Are the data consisting of the classifications A, B, C and D qualitative or quantitative? After the data are in out as 1, 2, 3, or 4, are they qualitative or quantitative? 10. Identify each of the following variables as qualitative or quantitative. 11. Each month interviewers visit about 69,000 of the 93 million households in the region and question the occupants over 18 years of age about their educational status. Their responses enable the interviewers to estimate the percentage of people in the labor force who are college educated. Compare parts a through c. 12. Complete the table to the right? 13. In one university, language professors incorporated a 10-week extensive program to improve students’ Japanese reading
comprehension. The professors collected 283 books originally written for Japanese children and required their students to read at least 40 of them as part of the grade in the course. The books were categorized into reading levels (color-coded for easy selection) according to length and complexity. Complete parts a through c. 14. A group of marketing professors asked every fourth adult entrant to a mall to participate in a study. A total of 119 shoppers agreed to answer the question, “Made locally� means what percentage of local labor and materials?� The responses of the 119 shoppers are summarized in the table to the right. Complete parts a through c below. 15. Graph the relative frequency histogram for the 300 measurements summarized in the relative frequency table to the right. 16. If jobs arrive at a particular work center at a faster rate than they depart, the work center impedes the overall production process and is referred to as a bottleneck. The data in the table were collected by an operations manager for use in investigating a potential bottleneck work center. 17. A data set contains the observations 3, 5, 4, 2, 3. Find the following values. 18. Calculate the mean and Median of the following grade point averages. 2.5
2.9
3.6
2.6
3.2
3.7
19. Five banks have been ranked by the amount charged to credit and debit cards issued by the banks. The table to the right gives the total amount charged in 2007 for the top ranked banks.
20. The data on the age (in years) of each of the 20 most powerful women in a region are shown below. 49
62
52
……………………………………….64
21. The salaries of superstar professional athletes receive much attention in the media. The multimillion-dollar long-term contract is now commonplace among this elite group. Nevertheless, rarely does a season pass without negotiations between one or more of the players’ associations and team owners for additional salary and fringe benefits for all players in their particular sports. Complete parts a and b below. 22. Calculate the range, variance, and standard deviation for the following sample. 3, -3,2,……………….4 23. A university’s language professors incorporated a 10-week extensive redaing program into a second-semester Japanese language course in an effort to improve students’ Japanese reading comprehension. Fourteen students participated in this reading program. Complete parts a through c. 24. A country’s Energy Information Administration monitors all nuclear power plants operating in that country. The table to the right lists the number of active nuclear power plants operating in each of a sample of 10 states. 25. A study of 100,000 first-time candidates for the CPA exam found that the mean number of semester hours of college credit taken by the candidates was 144.58 hours. The standard deviation was reported to be 15.73 hours. Complete parts a through c. 26. Compute the z-score corresponding to each of the values of x below.
27. Compare the z-scores to decide which of the x values below lie the greatest above the mean and the greatest distance below the mean. 28. A sample data set has a mean of 74 and a standard deviation of 10. Determine whether each of the following sample measurements are outliers. 29. Consider the horizandal box shown to the right. 30. Educators are constantly evaluating the efficacy of public schools in the education and training of students. One quantitative assessment of change over time is the difference in scores on the SAT. The table below contains the average SAT scores for 10 states for the years 1988 and 2005. 31. Data on annual rainfall, maximum daily temperature, percentage of planet cover, and number of anti species recorded at each of 11 study sites are given in the accompanying table. Complete parts a through c. 32. Determine whether the random variable is discrete or continuous. 33. The random variable x has the following discrete probability distribution. Complete parts a through f. 34. X intercept, y intercept 35. If x is a binomial random variable, compute p(x) for each of the cases below. 36. According to a business magazine, 30% all small businesses owned by non-Hispanic whites nationwide are women-owned firms. 37. According to a certain golf association, the weight of the golf ball ball shall not be greater than 1.620 ounces (45.93 grams). The velocity of the ball shall not be greater than 250 feet per second. The golf association periodically checks the specifications of golf balls using
sampling. Five dozen of each kind are sampled, and if more than three do not meet size or velocity requirements, that kind of ball is removed from the golf association’s approved list. Complete parts a and b. 38. Find the area under the standard normal probability distribution between the following pairs of z-scores. 39. Suppose the random variable x is the best described by a normal distribution with ¾ = 32 and = 5. Find the z-score that corresponds to each of the following x-values. 40. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon. 41. Personnel tests are designed to test a job applicant’s cognitive and/or physical abilities. A particular dexterity test is administered nationwide by a private testing service. It is known that for all tests administered last year, the distribution of scores was approximately normal with mean 76 and standard deviation 7.8. 42. Determine evidence to support or contradict the assumption that the data to the right come from an approximately normal distribution. 43. An airport terminal handles an average of 3,000 international passengers an hour, but is capable of handling twice that number. Also after scanning all luggage, 20% arriving international passengers are detained for intrusive luggage inspection. The inspection facility can handle 500 passengers an hour without unreasonable delays for the travelers. Complete parts a through c. 44. Will the sampling distribution of always be approximately normally distributed? Explain.
45. The number of semester hours of college credit taken by first-time candidates for a certain professional exam has a distribution with a mean of 127 hours and a standard deviation of 14 hours. Consider a random sample of 100 first-time candidates for the exam and let represent the mean number of hours of college credit taken for the sample. Complete parts a through e below. ---------------------------------------------------
QNT 561 Week 1 Lab Work (New)
For more course tutorials visit www.qnt561.com Chapter 2: Ex 4) Two Thousand three hundred frequent business travelers are asked which Midwestern city they prefer: Indianapolis, Saint Louis, Chicago or Milwaukee. 388 liked Indianapolis best, 450 liked Saint Louis, 1212 liked Chicago and the remainder prefers Milwaukee. Develop a frequency table and a relative frequency table to summarize this information (Round relative frequency to 3 decimal places.) Ex 6) A small business consultant is investigating the performance of several companies. The fourth-quarter sales for last year (in thousands of dollars) for the selected companies were: The consultant wants to include a chart in his report comparing the sales of six companies. Identify a bar chart that compares the fourth-quarter sales of these corporations.
Ex 12) the quick change oil company has a number of outlets in the metropolitan Seattle area. The daily number of oil changes at the Oak Street outlet in the past 20 days is: a.
How many classes would you recommend?
d. Organize the number of oil changes into a frequency distribution. Ex 14) the food services division of Cedar River Amusement Park Inc, is studying the amount that families who visit the amusement park spend per day on food and drink. A sample of 40 families who visited the park yesterday revealed they spend the following amounts: a. Organize the data into a frequency distribution, using seven classes and 15 as the lower limit of the first class. What class interval did you select? b.
Where do the data tend to cluster?
Ex 18) Ecommerce.com, a large Internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead time are reported in days. a.
How many orders were studied?
b.
What is the midpoint of the first class?
c. What are the coordinates of the first class for a frequency olygon assuming we draw a frequency polygon using the midpoints?
Ex 20) The following cumulative frequency polygon shows the selling price ($000) of house sold in the Billings, Montana, area a.
How many orders were studied?
b.
What is the class interval?
c.
One hundred homes sold for less than what amount?
d.
About 75% of the homes sold for less than what amount?
e.
Estimate the no of homes $150,000 up to $200,000 class.
f.
About how many homes sold for less than $225,000?
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QNT 561 Week 2 DQ 1 For more course tutorials visit www.qnt561.com What are some examples of operational definitions in research design within your profession? For example, in the education field, graduation rate and retention rate are important operational definitions to measure progress of students. Likewise other professions have common metrics and definitions. Identify some metrics and operational definitions from your own career or a profession that you know well. Tell us why you think it is important! ---------------------------------------------------
QNT 561 Week 2 DQ 2 For more course tutorials visit www.qnt561.com
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain. Provide an example where a sample might misrepresent data validity. For example, reflect on the current political campaign and the pollsters! ---------------------------------------------------
QNT 561 Week 2 Individual My Statslab Problem Set For more course tutorials visit www.qnt561.com 1. A random sample of 87 observations produced a mean = 25.7 and a standard deviation s = 2.6. 2. Health care workers who use latex gloves with glove powder on a daily basis are particularly susceptible to developing a latex allergy. Each in a sample of 50 hospital employees who were diagnosed with a latex allergy based on a skin-prick test reported on their exposure to latex gloves. Summary statistics for thr number of latex gloves used per week are = 19.4 and s = 11.6. Complete parts (a) – (d). 3. Each child in a sample of 62 low-income children was administered a language and communication exam. The sentence complexity scores had a mean of 7.63 and a standard deviation of 8.92. Complete parts a through d. 4. The random sample shown below was selected from a normal distribution. 4, 10, 7,‌.2. Complete parts a and b.
5. Periodically, a town water department tests the drinking water of homeowners such as lead. The lead levels in water specimens collected for a sample of 10 residents of the town had a mean of 3.1 mg/L and a standard deviation of 1.2 mg/L. Complete parts a through c. 6.
A random sample of size n = 250 yielded = 0.20.
7. A newspaper reported that 50% of people say that some coffee shops are overpriced. The source of this information was a telephone survey of 40 adults. 8. An accounting firm annually monitors a certain mailing service’s performance. One parameter of interest is the percentage of mail delivered on time. In a sample of 303,000 items mailed between Dec. 10 and Mar. 3---__ the most difficult delivery season due to bad weather and holidays__ the accounting firm determined that 245,200 items were delivered on time. Use this information to make a statement about the likelihood of an item being on time by that mailing service. 9. Suppose oyu’re given a data set that classifies each sample unit into one of four categories: A, B, C, or D. You plan to create a computer database consisting of these data, and you decide to code the data as A = 1, B = 2, C = 3, and D = 4. Are the data consisting of the classifications A, B, C and D qualitative or Quantitative? After the data are input as 1, 2, 3, or 4, are they qualitative or Quantitative? 10. In one university, language professors incorporated a 10-week extensive program to improve students’ Japanese reading comprehension. The professors collected 262 books originally written for Japanese children and required their students to read at least 40 of them as part of the grade in the course. The books were categorized into reading levels (color-coded for easy selection) according to length and complexity. Complete parts a through c.
11. Use the relative frequency table shown to the right to calculate the number of the 400 measurements failing into each of the measurements classes. Then graph a frequency histogram for these data. 12. Five banks have been ranked by the amount charged to credit and debit cards issued by the banks. The table to the right gives the total amount charged in 2007 for the top ranked banks. 13. Compare the z-scores to decide which of the x values below lie the greatest above the mean and the greatest distance below the mean. 14. Consider the horizandal box plot shown to the right. 15. Educators are constantly eveluating the efficacy of public schools in the education and training of tudents. One quantitative assessment of change over time is the difference in scores on the SAT. The table below contains the average SAT scores for 10 states for the years 1988 and 2005. 16. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon. ---------------------------------------------------
QNT 561 Week 2 Lab Work (New)
For more course tutorials visit www.qnt561.com Chapter 5:
Ex 4) A large company must hire a new president. The Board of Directors prepares a list of five candidates, all of whom are equally qualified. Two of these candidates are members of a minority group. To avoid bias in the selection of the candidate, the company decides to select the president by lottery. a.
What is the probability one of the minority candidate is hired?
b.
Which concept of probability did you use to make this estimate?
Ex 14) The chair of the board of directors says, “ There is a 50% chance this company will earn a profit, a 30% chance it will break even, and a 20% chance it will lose money next quarter”: a. Use an addition rule to find the probability the company will not lose money next quarter b. Use the complement rule to find the probability it will not lose money next quarter. Ex 34) Use Bayes’ theorem to determine P(A3| B1) Chapter 6: Ex 4) Which of these variables are discrete and which are continuous random variables? a.
The number of new accounts established by a salesperson
b.
The time between customer arrivals to a bank ATM
c.
The number of customers in Big Nick’s barber shop
d.
The amount of fuel in your car’s gas tank
Ex 20) Binomial Distribution Chapter 7:
Ex 4) According to the insurance institute of America, a family of four spends between $400 and $3,800 per year on all type of insurance. Suppose the money spent is uniformly distributed between these amounts. a.
What is the mean amount spent on insurance?
b.
What is S.D of the amount spent?
c. If we select a family at random, What is the probability they spend less than $2,000 per year on insurance per year? d.
What is the probability a family spends more than $3,000 per year?
Ex 14) A normal population has a mean of 12.2 and a standard deviation of 2.5 a.
Complete the z value associated with 14.3
b.
What proportion of the population is between 12.2 and 14.3?
c.
What proportion of the population less than 10?
Ex 18) A normal population has a mean of 80.0 and a standard deviation of 14.0 a.
Compute the probability of a value between 75.0 and 9.0
b.
Compute the probability of a value of 75.0 or less
c.
Compute the probability of a value between 55.0 and 70.0
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QNT 561 Week 2 Team Assignment Business Research Project Part 1 Business Problem and Research Questions
For more course tutorials visit www.qnt561.com Identify an organization or business for your Learning Team research project. Describe the products or services it provides. Identify a problem or dilemma faced by the organization that could be addressed by research. Discuss the problem as a team. Discuss your selected problem or dilemma with your faculty member to ensure that it is at an appropriate scope for the course. Develop a purpose statement for your research project. Create a draft of the research questions addressing the problem and purpose statements. Format your paper consistent with APA guidelines. Click the Assignment Files tab to submit your assignment. ---------------------------------------------------
QNT 561 Week 2 Team Assignment Business Research Project Part 1 Formulation of the Research Problem For more course tutorials visit www.qnt561.com
Identify an organization from any member in your Learning Team or an organization with which your team is familiar. If an actual company is used, disguise its name with a pseudonym. Identify one independent variable and one dependent variable based on the business. Operationalize these variables if they are too abstract to measure. Develop a real or realistic research question for the company you chose and the two variables. Include a background, a business problem and the team's role of no more than 500 words. Develop a research question from the two variables. Keep you research question simple, easy to understand and able to be quantified with research data. Use the Research Question Two Variable Handout for guidance. Create hypothesis statements based on the research question. Format your paper consistent with APA guidelines. Click the Assignment Files tab to submit your assignment. ---------------------------------------------------
QNT 561 Week 3 DQ 1 For more course tutorials visit www.qnt561.com In your organization’s management development program, there was a heated discussion between people who claimed that theory is impractical and not effective, and others who claimed that effective theory is the
most practical approach to problems. What position would you take and why? ---------------------------------------------------
QNT 561 Week 3 DQ 2 For more course tutorials visit www.qnt561.com You observe female sales representatives having lower customer defections than male sales representatives. What concepts and constructs would you use to study this phenomenon? How might the concepts or constructs relate to explanatory hypotheses? Explain. ---------------------------------------------------
QNT 561 Week 3 Individual Mystatslab Problem Set For more course tutorials visit www.qnt561.com 1. Which hypothesis, the null or the alternative, is the status-quo hypothesis? 2. A university economist conducted a study of elementary school lunch menus. During the state-mandated testing period, school lunches averaged 890 calories. The economist claimed that after the testing period ended, the average caloric content of the school lunches
increased/dropped significantly. Set up the null and alternative hypothesis to test the economist’s claim. 3. Suppose the mean GPA of all students graduating from a particular university in 1975 was 2.40. The register plans to look at records of graduating last year to see if the mean GPA has decreased. Define notation and state the null and alternative hypothesis for this investigation. 4. A random sample of 100 observations from a population with standard deviation 58 yielded a sample mean of 111. Complete parts a through c. 5. A final scores of games of a certain sport were compared against the final point spreads established by oddsmakers. The difference between the game outcome and point spread (called a point-spread error) was calculated for 250 games. The mean and standard deviation of the point-spread errors are = 1.7 and s = 13.1. Use this information to test the hypothesis that the true mean point-spread error for all games differs from 0. Conduct the test at α = 0.10 and interpret the result. 6. If a hypothesis test were conducted using α = 0.025, for which of the following p-values would the null hypothesis be rejected? 7. For the α and observed significance level (p-value) pair, indicate whether the null hypothesis would be rejected. α = 0.10, p-value = 0.001 8. In a test of the hypothesis H0:µ = 40 versus Ha: µ ≠ 40, a sample of n = 50 observations possessed mean = 40.7 and standard deviation s = 3.8. Find the p-value for this test.
9. In a study it was found that the averge age of cable TV shoppers was 55 years. Suppose you want to test the null hypothesis, H0:Âľ = 55, using a sample of n = 60 cable TV shoppers. 10. A sample of seven mesurements, randomly selected from a normally distributed population, resulted in the summary statistics = 4.6 and s = 1.2. Complete parts athrough c. 11. A study analysis recent incidents involving terrorist attacks. Data on the number of individual suicide bombings that occurred in each of 20 sampled terrorist group attcks against a country is reproduced in the data table below. An Excel/DDXL printout is shown to the right. Complete parts a through e. 12. When planning for a new forest road to be used for tree harvesting, planners must select the location to minimize tractor skidding distance. The skidding distances (in meters) were measured at 20 randomly selected road sites. The data are given below. A logger working on the road claims the mean skidding distance is atleast 424 meters. Is there sufficient evidence to refute this claim? Use Îą = 0.10 / Îą = 0.01. 13. For the binomial sample sizes and null hypothesized values of p in each part, determine whether the sample size is large enough to meet the required conditions for using the normal approximation to conduct a valid large-sample hypothesis test of the null hypothesis H0: p = p0. Complete parts a through e. 14. Suppose a consumer group rated 49 brands of toothpaste based on whether or not the brand carries an American Dental Association (ADA) seal verifying effective decay prevention. The results of a hypothesis test for the proportion of brands with the seal are shown to the right. Complete parts a through c.
15. In order to compare the means of two populations, independent random samples of 410 observations are selected from each population, with the results found in the table to the right. Complete parts a through e. 16. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples? 17. 18. Independent random samples are selected from two populations and are used to test the hypothesis H0: (µ1 - µ2) = 0 against the alternative Ha: (µ1 - µ2) ≠ 0. An analysis of 234 observations from population 1 and 310 from population 2 yielded a p-value of 0.113. Complete parts a and b below. 19. A study was done to examine whether the perception of service quality at hotels differd by gender. Hotel guests were randomly selected to rate service items on a 5-point scale. The sum of the items for each guest was determined and a summary of the guest scores are provided in the table. Complete parts a and b. 20. To determine if winning a certain award leads to a challenge in life expectancy, researches sampled 748 award winners and matched each one with another person of the same sex who was in the same profession and was born in the same era. The lifespan of each pair was compared. Complete parts a through c below. 21. A new testing method was developed to reduce a certain ratio. The data in the table show the ratios that resulted from testing six components using the standard method and the new method. Compare
the two methods with a 90% confidence interval. Which method has the smaller mean ratio? 22. Consider making an interference about p1 – p-2 , where there are x1 successes in n1 binomial trails and x2 succeseses in n2 binomial trails. 23. Construct a 90% confidence interval for (p1 – p2) in each of the following situations. 24. In auction bidding the “winner’s curse” is the phenomenon of the winning (or highest) bid price being above the expected value of the item being auctioned. A study was conducted to see if less-experienced bidders were more likely to be impacted by the curse than superexperienced biders. The study showed that of the 180 bids by superexperienced bidders, 26 winning bids were above the item’s expected value, and of the bids by the 140 less-experienced bidders, 31 winning bids were above the item’s expected value. Complete parts athrough d. 25. School buying is a form of aggressive behavior that occurs when a student is exposed repeatedly to negative actions from another student. In order to study the effectivenss of an antibullying policy at elementary schools, a survey of over 2,000 elementary school children was conducted. Each student was asked if he or she ever bullied another student. In a sample of 1358 boys, 745 Claimed they had never bullied another student. In a sample of 1379 girls, 966 claimed they had never bullied another student. Complete parts a through f below. 26. A study was conducted to determine the demographics of two types of product managers. Independent samples of n1 = 99 consumer/commercial group, 41%(1) of the product managers are 40 years of age or older; in the industrial group, 55%(2) are 40 or more years old. Make an interference about the differnce between the true
proportions of consumer/commercial and industrial product managers who are at least 40 years old. ---------------------------------------------------
QNT 561 Week 3 Lab Work (New)
For more course tutorials visit www.qnt561.com Chapter 8: Ex 2) The following is a list of 29 hospitals in the Cincinnati (Ohio) and Northern Kentucky region. The hospitals are identified by numbering them 00 through 28. Also included is whether the hospital is a general medical/surgical hospital (M/S) or a specialty hospital (S). we are interested in estimating the average number of full- and part-time nurses employed in the area hospitals. Ex 8) A population consists of the following five values : 1,1,6,7,9. a.
List all samples of size 3, and compute the mean of each sample
b. Compute the mean of the distribution of sample means and the population mean. Ex 12) scrapper Elevator Company has 20 sales representatives who sell its product throughout the United States and Canada. The number of units sold last month by each representative is listed below. Assume these sales figures to the population values a.
Compute mean and population
Ex 16) A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. a.
Less than 74
b.
Between 74 and 76
c.
Between 76 and 77
d.
Greater than 77
Chapter 9: Ex 4) Suppose you know σ and you want an 85% confidence level. What value would you use as z in formula of confidence interval for a population mean? Ex 6) A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found the distribution of amounts spent per week followed the normal distribution with a population standard deviation of $5. A sample of 64 steady smokers revealed that x = 20 a.
What is the 95% confidence interval estimate of μ?
Ex 10) Use Appendix B.5 to locate the value of t under the following conditions. a.
The sample size is 15 and the level of confidence is 95%
b.
The sample size is 24 and the level of confidence is 98%
c.
The sample size is 12 and the level of confidence is 90%
Ex 26) Past surveys reveal that 30% of tourists going to Las Vegas to gamble spend more than $1,000. The visitor’s Bureau of Las Vegas wants to update this percentage.
a. The new study is to use the 90% confidence level. The estimate is to be within 1% of the population proportion. What is the necessary sample size? b. The bureau feels the sample size determined above is too large. What can be done to reduce the sample? Based on your suggestions, recalculate the sample size. Ex 28) Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9. Develop a 99% confidence interval for the population mean ---------------------------------------------------
QNT 561 Week 3 Team Assignment Business Research Project Part 2 Research Plan (2 Papers) For more course tutorials visit www.qnt561.com This Tutorial contains 2 different Papers Develop a plan for your Business Research Project in approx. 800 words.
Revise the research questions based on instructor feedback from the previous week. Identify population and samples for your research. Describe who will be chosen and how they will be accessed. Determine the data collection process.
Describe the format of the survey and the basic item content to be gathered. Determine how the survey will be distributed and collected. Format your plan consistent with APA guidelines. Click the Assignment Files tab to submit your assignment.. ---------------------------------------------------
QNT 561 Week 4 Discussion Descriptive Statistics For more course tutorials visit www.qnt561.com Create a Microsoft® Excel® spreadsheet with the two variables from a dataset for your choosing. Analyze the data with MegaStat®, StatCrunch®, Microsoft® Excel®or other statistical tool(s), including: (a) Descriptive stats for each numeric variable and (b) Histogram for each numeric variable and either (c) or (d) (c) Bar chart for each attribute (non numeric) variable (d) Scatter plot if the data contains two numeric variables Determine the appropriate descriptive statistics.(a) For normally distributed data use the mean and standard deviation.
(b) For significantly skewed data use the median and interquartile range. Submit the spreadsheet/work and explain your thought process and results. ---------------------------------------------------
QNT 561 Week 4 DQ 1 For more course tutorials visit www.qnt561.com does technological advancement affect the ability to collect data? Provide examples. Does this advancement increase the chance for errors? Explain. ---------------------------------------------------
QNT 561 Week 4 DQ 2 For more course tutorials visit www.qnt561.com What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example. ---------------------------------------------------
QNT 561 Week 4 Individual Mystatslab Problem Set
For more course tutorials visit www.qnt561.com 1. Researchers conducted a survey of a representative sample of over 1,000 drivers. Based on how often each driver engaged in road behaviour, a road rage score was given. The drivers were also grouped by annual income. The data were subjected to an analysis of variance, with the results summarized in the table. 2. Researchers surveyed a random sample of 25 employees who were enrolled in a certain program at one of three universities. These individuals were divided into four distinct groups, 1, 2, 3, and 4, depending on their job situation at a previous or current firm. The sampled employees completed a questionnaire on their ethical perceptions of downsizing. One item asked employees to respond to the statement, “It is unethical for a downsizing decision to be implemented on or prior to a major holiday.” Responses were measured using a 5point Likert scale, where 1 = strongly agree, 2 = agree, 3 = neutral, 4 = disagree, and 5 = strongly disagree. Data on both the qualitative variable “Group” and the quantitaive variable “Ethics response” are shown in the accompanying table. The researchers’ goal was to determine if any differences exist among the mean ethics scores for the four groups. Complete parts a through d. 3.
What conditions must n satisfy to make the x2 test valid?
4. There has been a recent trend for sports franchises in baseball, football, basketball, and hockey to build new stadiums and ballsparks in urban, downtown venues. A magazine investigated whether there has been a significanr suburban-to-urban shift in the location of major sport facilities. In 1985 40% of all major sports facilities were located downtown, 30%in central city, and 30% in suburban areas. In contrast,
of the 122 major sports franchises that existed in 1997, 65 were built downtown 28 in a central city, and 29 in a suburban area. Complete parts a through e. 5. Each child in a sample of 63 low-income children was administered a language and communication exam. The sentence complexity scires had a mean of 7.63 and a standard deviation of 8.95. Complete parts a through d. 6. Which hypothesis, the null or the alternative, is the status-quo hypothesis? 7. Suppose the mean GPA of all students graduating from a particular university in 1975 was 2.50. The register plans to look at records of students graduating last year to see if the mean GPA has changed. Define notation and state the null and alternative hypothesis for this investigation. 8. A random sample of 100 observations from a population with standard deviation 65 yielded a sample of 112. Complete parts a through c. 9. For the Îą and observed significance level (p-value) pair, indicate whether the null hypothesis would be rejected. 10. A study analysis recent incidents involving terrorist attacks. Data on the number of individual suicide bombings that occurred in each of 20 sampled terrorist group attcks against a country is reproduced in the data table below. An Excel/DDXL printout is shown to the right. Complete parts a through e. 11. When planning for a new road to be used for tree harvesting, planners must select the location to minimize tractor skidding distance. The skidding distances (in meters) were measured at 20 randomly
selected road sites. The data are given below. A logger working on the road claims the mean skidding distance is atleast 398 meters. Is there sufficient evidence to refute this claim? Use Îą = 0.05. 12. Suppose a consumer group rated 47 brands of toothpaste based on whether or not the brand crries an American Dntal Association (ADA) seal verifying effective decay prevention. The results of a hypothesis test for the proportion of brands with the seal are shown to the right. Complete parts a through c. 13. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples? 14. A study was done to examine whether the perception of service quality at hotels differed by gender. Hotel guests were randomly selected to rate service items on a 5-point scale. The sum of the items for each guest was determined and summary of the guest scores are provided in the table. Complete parts a and b. 15. To determine if winning a certain award leads to a change in life expectancy, researchers sampled 761 award winners and matched each one with another person of the same sex who was in the same profession and was born in the same era. The ilfespan of each pair was compared. Complete parts a through c below. 16. School bullying is a form of aggressive behaviour that occurs when a student is exposed repeatly to nagative actions from another student. In order to study the effectiveness of an antibullying policy at elementary schools, a survey of over 2,000 elementary school children was conducted. Each student was asked if he or she ever bullied another student. In a sample of 1358 boys, 747 claimed they had never bullied
another student. In a sample of 1379 girls, 964 claimed they had never bullied another student. Complete parts a through f below. ---------------------------------------------------
QNT 561 Week 4 Lab Work (New)
For more course tutorials visit www.qnt561.com Chapter 10: Ex 2) A Sample of 36 observations is selected from a normal population. The sample mean is 12, and the population standard deviation is 3. Conduct the following test of hypothesis using the 0.01 significance level. EX 12) The management of White Industries considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of sample was 2.7 minutes. Using the .10 level of significance, can we conduct that the assembly time using the new method is faster? a.
What is the decision rule?
b.
Compute the value of test statistic.
c.
What is your decision regarding Ho?
Ex 16) with the given hypotheses:
A random sample of six resulted in the following values: 118, 105, 112, 119, 105 and 111. Assume a normal population a.
Using the .05 significance level, determine the decision rule?
b.
Compute the value of the test static.
c.
1. What is your decision regarding the Ho?
2. Can we conclude the mean is different from 100? d. Estimate the p-value Chapter 11: Ex 2) A sample of 65 observations is selected from one population with a population standard deviation of 0.75. The sample mean is 2.67. A sample of 50 observations is selected from a second population with a population standard deviation of 0.66. The sample mean is 2.59. Conduct of the following test of hypothesis using the .08 significance level. a.
This is a ‌‌‌ tailed test
b.
State the decision rule
c.
Compute the value of the test statistic
d.
What is your decision regarding Ho?
e.
What is the p-value?
Ex 8) The null and alternate hypotheses are: A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample S.D of 12. A random sample of 17
observations from the second population revealed a sample mean of 342 and a sample S.D of 15. At the .10 significance level, is there a difference in the population means? a.
This is a ……… tailed test
b.
The decision rule is to reject ……..
c.
The test statistic is t= ………..
d.
What is your decision regarding Ho?
e.
The p-value is between 0.1 and 0.2?
Ex 14) The null and alternate hypotheses are: A random sample of 20 items from the first population showed a mean of 100 and a S.D of 15. A sample of 16 items from the second population showed a mean of 94 and a S.D of 8. Use the .05 significance level a.
Find the degrees of freedom for unequal variance test
b.
State the decision rule for .05 significance level?
c.
Compute the value of test statistic.
d.
What is your decision regarding null hypothesis?
Chapter 12: Ex 8) The following are six observations collected from treatment 1, four observations collected from treatment 2, and five observation
collected from treatment 3. Test the hypothesis at the 0.05 significance level that the treatment means are equal. a.
State the null and the alternate hypothesis.
b.
What is the decision rule?
c.
Compute SST SSE, SS total
d.
Complete the ANOVA table.
e.
State your decision regarding null hypothesis?
Ex 12) From the given data of retail and banking stock a. Using the .05 level of significance, is there a difference in the mean rate of return among the three types of stock? b. Can the analyst conclude there is a difference between the mean rates of return for utility and retail stocks? For utility and banking stocks? For banking and a retail stocks? Explain Ex 18) There are three hospitals in the Tulsa, Oklahoma area. The following data show the number of outpatient surgeries performed on Monday, Tuesday, Wednesday, Thursday, and Friday at a each hospital last week. At the 0.05 significance level, can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? a.
Set up the null hypothesis and the alternative hypothesis.
b.
Alternative hypothesis
c.
For blocks
d.
Alternative hypothesis
e.
State the decision for .05 significance level
f.
Complete the ANOVA table
g.
State your decision regarding null hypothesis?
h.
The decision for F value at 0.05 significance is:
i. Can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? Chapter 16: Ex 16) The null hypothesis and the alternate hypothesis are: a.
State the decision rule, using 0.05 significance level
b.
Compute the value of chi-square
c.
What is your decision regarding Ho?
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QNT 561 Week 4 Team Assignment Business Research Project Part 3 Survey and Data Collection Plan (2 Sets) For more course tutorials visit www.qnt561.com This Tutorial contains 2 different sets
Create a draft of the survey. Conduct a pilot pretest having another Learning Team in the class to provide feedback for your team. Chet will create a message thread for each team to place their survey in the Class Discussion Tab.
Revise the survey based on the feedback provided by your classmates. Describe in a paragraph or two at the end of your survey what feedback was provided by the other team and how did that impact this final survey from you initial draft. Click the Assignment Files tab to submit your final survey that you deploy. ---------------------------------------------------
QNT 561 Week 5 DQ 1 For more course tutorials visit www.qnt561.com What is the value of performing hypotheses tests to solve problems related to business and operations management? Provide specific examples. ---------------------------------------------------
QNT 561 Week 5 DQ 2 For more course tutorials visit www.qnt561.com What are differences between dependent and independent samples? Provide examples. What are implications for determining the tests used to analyze data?\
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QNT 561 Week 5 Individual Mystatslab Problem Set For more course tutorials visit www.qnt561.com 1.
Consider the pairs of measurements shown to the right.
2. Researchers investigated the effect of tablet surface area to volume on the rate at which a drug is released in a controlled-release dosage. For six similarly shaped tablets with different weights and thicknesses, the diffusional drug release rate (percentage of drug released divided by the square root of time) was determined. The experimental data are listed in the table. Complete parts a through d. 3. Many entrepreneurs have donated money to various causes. Data on the total amount pledged and remaining net worth for the 10 top donors are given in the table. Complete parts a through d. 4. Explain what each of the following sample correlation coefficients tells you about the relationship between the x and y values in the sample. 5. Construct a scttergram for each data set. Then calculate r and r2 for each data set. Interpret their values. Complete parts a through d. 6. A university conducted a study on 446 business graduates who had all completed the same business course. The study used correlation coefficients to investigate the relationship between many different business skills. Two of the many variables measured were selfknowledge skill level (x) and goalsetting ability (y). The correlation was r = 0.82. Complete parts a through c below.
7. Studies of managers from two countries in the 1970s found differences of opinion toward quality management. To find out if these differences continue to exist, researchers surveyed 100 managers in each country in the electronics manufacturing industry. The accompanying table gives the percentages of managers from each country who agree with each of 10 randomly selected statements regarding quality. Complete parts a through c. 8. Suppose a statistication built a multiple regression model for predicting the total number of runs scored by a baseball team during a season.Use the β estimates to predict the number of runs scored by a team with 303 walks, 856 singles, 263 doubles, 37 triples, and 124 home runs. 9. Consider fitting the multiple regression model, E(y), below. A matrix of correlations for all pairs of independent variables on the right. Do you detect a multicollinearity problem? 10. Identify the problem(s) in the residual plots shown below. 11. Researchers conducted a survey of a representative sample of over 1,000 drivers. Based on how often each driver engaged in road rage behaviour, a road rage score was given. The driver were also grouped by animal income. The data were subjected to an analysis of variance, with the results summarized in the table. 12. What conditions must n satisfy to make the x2 test valid? 13. There has been a recent trend for sports franchises in baseball, football, basketball, and hockey to build new stadiums and ballsparks in urban, downtown venues. A magazine investigated whether there has been a significanr suburban-to-urban shift in the location of major sport facilities. In 1985 40% of all major sports facilities were located
downtown, 30%in central city, and 30% in suburban areas. In contrast, of the 122 major sports franchises that existed in 1997, 65 were built downtown 28 in a central city, and 29 in a suburban area. Complete parts a through e. ---------------------------------------------------
QNT 561 Week 5 Lab Work (New) For more course tutorials visit www.qnt561.com Chapter 13: Ex 6) The owner of Maumee Ford-Mercury-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. a. If we wants to estimate selling price on the basis of the age of car, which variable is thr dependent varialble and which is the independent variable? b.
1. Determine the correlation coefficient
2. Determine the coefficient of determination. c. Interpret the correlation coefficient. Does it surprise you that the correlation coefficient is negative? Ex 14) The following sample observations were randomly selected. a.
Determine the regression equation.
b.
Determine the value of Y when X is 7.
Ex 18) We are studying mutual bond funds for the purpose of investing in several funds. For this particular study, we want to focus on the assets fund and its five-year performance. The question is : can the five-year rate of return be estimated based on the assets of the fund? Nine mutual funds were selected at random, and their assets and rates of returns are shown below: b-1. Compute the coefficient of correlation. b-2. Compute the coefficient of determination c. Give a description of the degree of association between the variables. d. Determine the regression equation. Use assets as the independent variable e. For a fund with $400.0 million in sales, determine the five year rate of return Ex 22) The owner of Maumee Ford-Mercury-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during last year The regression equation is y=11.18-0.48X, the sample size is 12, and the standard error of the slope is 0.23. Use the .05 significance level. Can we conclude that the slope of the regression line is less than zero? Chapter 14: Ex 2) Thompson photo Works purchased several new, highly sophisticated processing machines. The production department needed some guidance with respect to qualification needed by an operator. Is age a factor? Is the length of service as an operator important? In order
to explore further the factors needed to estimate performance on the new processing machines, four variables were listed? X1 = Length of time an employee was in industry X2= Mechanical aptitude test score X3= Prior on-the-job rating X4= Age Performance on the new machine is designated y. What is this equation called? How many dependent and independent variable are there? What is the number 0.286 called? As age increases by one year, how much does estimated performance on the new machine increase? Carl Knox applied for job at photo works? He has been in business for 6 yrs and scored 280 on the mechanical aptitude test Carl’s prior on-thejob performance rating is 97, and he is 35 years old Ex 6) Consider the ANOVA table that follows a.1. Determine the standard error of estimate a.2. About 95% of the residuals will be between what two values? b.1. Determine the coefficient of multiple determination. b.2. Determine the percentage variation for the independent variables. c. Determine the coefficient of multiple determinations, adjusted for the degree of freedom
Ex 8) The following regression output was obtained from a study of architectural firms. The dependent variables is the total amount of fees in millions of dollars. X1 is the no of architects employed by the company X2 is the no of engineers employed by the company X3 is the no of years involved with health care projects X4 is the no of states in which the firm operates X5 is the percent of the firm’s work that is health care-related a.
Write out the regression equation
b. How large is the sample? How many independent variables are there? c.
1. State the decision rule for .05 significance level:
2. Compute the value of F statistics 3. Can we conclude that the set of regression coefficients could be different from 0? d.
1. State the decision rule for .05 significance level:
2. Compute the value of test statistics 3. Which variable you consider eliminating? ---------------------------------------------------
QNT 561 Week 5 Team Assignment Business Research Project Part 4 Data Analysis (2 Sets)
For more course tutorials visit www.qnt561.com This Tutorial contains 2 different sets Administer the survey. In a paper in the APA format describe the following: Determine the sample process including sample contact, survey distribution, and survey collection. Organize, prepare, and describe the data. Include tables and figures as necessary to visually present the data. Think of this as a progress report to the CEO. He/She has provided your resources to conduct your research and you have just completed the deployment of your survey with some raw data BUT your analysis is not completed! This is to provide the CEO a quick touch point informing them how everything went, what are your initial thoughts, showing them your raw results (# counts and percentages) for each question, and anything that is jumping out at you at this point. You will provide your detailed analysis in Week 6. Click the Assignment Files tab to submit your assignment. ---------------------------------------------------
QNT 561 Week 6 Lab Work (New) For more course tutorials visit www.qnt561.com
Chapter 18: EX.2) Listed Below is the number of movie tickets sold at the Library Cinema-Complex, in thousands, for the period from 2001 to 2013. Compute a five-year weighted moving average using weights of 0.15, 0.15, 0.25, 0.16, and 0.29, respectively. Describe the trend in yield. EX 10) Appliance Center sells a variety of electronic equipment and home appliance. For the last 4 years, 2010 through 2013, the following quarterly sales (in $ millions) were reported. Determine the typical seasonal index for each of four quarters. ---------------------------------------------------
QNT 561 Week 6 Team Assignment Business Research Project Part 5 Research Report and Presentation (2 Sets) For more course tutorials visit www.qnt561.com This Tutorial contains 2 Sets of Report and Presentation Complete the cumulative Business Research Report in approx. 1,500 words by collaborating with your team to include the following: Revised tables or figures based on prior instructor feedback The description or interpretation for the tables or figures Summary of Learning Team results Answers to the research questions Research challenges
Steps to minimize challenges in future research Rationale for the survey items Analyze the implications of the team's results in relation to the business. There should be at least one graduate level statistical equation used to support your analysis. Recommend avenues for future research based on your research results, challenges, and implications. Format your Business Research Report consistent with APA guidelines. Develop a Microsoft速PowerPoint速presentation of no more than 15 slides that includes the following elements: Overall picture of the research process Summary of the research results including specific answers to the research questions Summary of the challenges, implications, and recommendations Submit the cumulative Business Research Report and Microsoft速 PowerPoint 速presentation to your instructor. Click the Assignment Files tab to submit your assignment. -------------------------------------------------------------------