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BUS308 Week 1 Week One Problems Week One Problems Complete the following problems from the textbook and submit all work in a Word file. You may copy and paste Excel files as a picture into the Word document (see tutorials in chapter appendices). MegaStat is an optional, but recommended, Excel add-on that simplifies statistical analysis in Excel. It is available to download for a fee at the MegaStat website (http://highered.mcgrawhill.com/sites/0077425995/information_center_view0/). Please note that MegaStat works with all recent versions of Excel, including Excel 2007 and Excel 2010, but for Mac is only currently compatible with Excel for Mac 2011. a. Chapter 1: 1.2, 1.17 b. Chapter 3: 3.3, 3.22 Carefully review the Grading Rubric for the criteria that will be used to evaluate your assignment.

BUS 308 Week 1 DQ1 Performance Report You are the manager at a company and are asked to present a report on the year-to-date performance of your division. What type of statistical information would you include in your report? In particular, which descriptive statistics (mean, median, standard deviation, etc.) do you think would best represent the main aspects of the performance of your division? What types of graphical presentation (histogram, dot plot, stem-and-leaf, bar chart, etc.) would you include? Explain your reasoning. Respond to at least two of your classmatesâ&#x20AC;&#x2122; postings.

BUS 308 Week 1 DQ2

The Empirical Rule vs. Chebyshev’s Theorem Discuss how the Empirical Rule works and how it relates to the bell curve as illustrated in Figure 3.14 (a). Then, explain Chebyshev’s Theorem and how it is different from the Empirical Rule. Give a specific example of a population with which the Empirical Rule might be most effective and one with which Chebyshev’s Theorem might be most effective. Respond to at least two of your classmates’ postings

BUS308 Week 1 Quiz 1.The two types of quantitative variables are ordinal and ratio. interval and ordinal. nominative and ordinal. interval and ratio. nominative and interval. 2.As a general rule, when creating a stem-and-leaf display, there should be between ______ stem values. 3 and 100 1 and 100 no fewer than 20 3.The median is the value below which and above which approximately 50 percent of the measurements lie. True False 4.Temperature in degrees Fahrenheit is an example of a ____ variable. nominative ordinal interval ratio

5.Stem-and-leaf displays and dot plots are useful for detecting Outliers Skewness Midpoint of data All of the above 6.Any characteristic of a population unit is called a measurement. sample. observation. variable. 7.The science of using a sample to make generalizations about the important aspects of a population is known as Statistical Process Control. Descriptive Statistics. A random sample. Statistical Inference. 8.A normal population has 99.73 percent of the population measurements within ___ standard deviations of the mean. one

two

three

four

9.When we are choosing a random sample and we do not place chosen units back into the population, we are

sampling with replacement.

sampling without replacement.

using a Systematic Sample.

using a Voluntary Response Sample.

10.An example of manipulation of graphical display used to distort reality is:

Zero at the axes

Equal widths of bars in a histogram

Stretched axes

A&C

BUS308 Week 2 DQ1 Relative Frequency Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various countries do not conform to the theoretical prediction. What do you think accounts for this variation? Can you think of other cases where the expected probabilities do not quite agree with the empirical values? Respond to at least two of your classmatesâ&#x20AC;&#x2122; postings BUS308 Week 2 DQ2 Applications for Probability In what situations might you use probability as a manager to approach business-related problems? What are the advantages to using probability concepts in business decisions? Are there any disadvantages or possible pitfalls to avoid in using probability in business? Respond to at least two of your classmatesâ&#x20AC;&#x2122; postings BUS308 Week 2 Week Two Problems Week Two Problems Complete the following problems from the textbook and submit them as a Word file. When appropriate, you may use either Excel or Megastat to complete (see tutorials in chapter appendices). a. Chapter 4: 4.4, 4.20 b. Chapter 5: 5.12 c. Chapter 6: 6.22(a) Carefully review the Grading Rubric for the criteria that will be used to evaluate your assignment. BUS308 Week 2 Quiz 1. In the application of Bayes' Theorem the sample information is combined with prior probabilities to obtain posterior probabilities 2. The actual weight of hamburger patties is an example of a continuous random variable 3. A student's grade on an examination was transformed to a z value which is negative. Therefore, we know that he scored

4. The expected value of a discrete random variable is: 5. The following formula: P(A U B) = P(A) + P(B) - P(A ∩ B) represents 6. A standard normal distribution has a mean of ____and standard deviation of ____ 7. A(n) __________ is a measure of the chance that an uncertain event will occur 8. The MPG (mileage per gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2? 9. For a Poisson random variable the mean and the variance equal the average number of occurrences over the time interval (µx = ó2x = µ) 10. In a statistical study, the random variable , if the house is colonial, and if the house is not colonial, then it can be stated that the random variable is continuous BUS308 Week 3 DQ1 Unscientific Sampling Consider question 7.45 from the text: A Milwaukee television station, WITI-TV, conducted a telephone call-in survey asking whether viewers liked the new newspaper, the Journal Sentinel. On April 26, 1995, Tim Cuprisin, a columnist for the Journal Sentinel, wrote the following comment: “WITI-TV (Channel 6) did one of those polls—which they admit are unscientific— last week and found that 388 viewers like the new Journal Sentinel and 2,629 didn’t like it. We did our own unscientific poll on whether those Channel 6 surveys accurately reflect public opinion. The results: a full 100 percent of the respondents say absolutely, positively not.” Is Cuprisin’s comment justified? Write a short paragraph explaining your answer, and respond to at least two of your classmates’ postings BUS308 Week 3 DQ2 Article Review Many articles present statistical data and list margins of error (for example, reports on political opinion polls, growth or decline of the housing markets, manufacturing sectors, etc.). Find one such article from a reliable source (such as EBSCO or Proquest) in the online library that includes a construction of confidence intervals for the data studied, and give a summary of the topic and the statistical results presented. In particular, discuss whether there is enough information presented in the article to arrive at the same conclusion as reported. Respond to at least two of your classmates’ postings BUS308 Week 3 Week Three Problems

Week Three Problems Complete the following problems from the textbook and submit them as a Word file. When appropriate, you may use either Excel or Megastat to complete (see tutorials in chapter appendices). a. Chapter 7: 7.11, 7.30 b. Chapter 8: 8.8, 8.38 Carefully review the Grading Rubric for the criteria that will be used to evaluate your assignment. BUS308 Week 3 Quiz 1. When the sample size and sample standard deviation remain the same, a 99% confidence interval for a population mean, Âľ will be _____ the 95% confidence interval for Âľ. 2. A sample statistic is an unbiased point estimate of a population parameter if the mean of the population of all possible values of the statistic equals the population parameter 3. When the sample size and the sample proportion remain the same, a 90% confidence interval for a population proportion p will be ______ the 99% confidence interval for p 4. A manufacturing company measures the weight of boxes before shipping them to the customers. If the box weights have a population mean and standard deviation of 90 lbs and 24 lbs respectively, then, based on a sample size of 36 boxes, the probability that the average weight of the boxes will be less than 84 lbs is 5. When the population is normally distributed and population standard deviation â&#x2C6;&#x2018; is unknown, then for any sample size n, the sampling distribution of is a t distribution 6. The central limit theorem states that as sample size increases, the population distribution more closely approximates a normal distribution 7. The results of a scientific poll showed that 64 out of 400 patients at a certain hospital are not satisfied with the care they received in the hospital after major surgery. A consumer advocate claims that 20% of the major surgery patients at the hospital are dissatisfied with after-surgery care. If the advocate's claim is true, what is the probability that 64 or fewer of 400 randomly selected patients at the hospital would say they are dissatisfied with the after-surgery care 8. If the population proportion is .4 with a sample size of 20, then is this sample large enough so that the sampling distribution of is a normal distribution 9. When a confidence interval for a population proportion is constructed for a sample size and the value of, the interval is based on the