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Week 5

1. Question : z = 2.43.

Find the area under the normal distribution curve between z = 1.52 and

2.

For the 20 test scores shown, find the percentile rank for a score of 86.

Question :

75 63 92 74 86 50 77 82 98 65 71 89 75 66 87 59 70 83 91 73

3. Question : student's class rank.

If a student's percentile rank in a class of 400 students is 87, find the

4.

Question :

Find the value for the correlation coefficient r.

5.

Question :

Find the median.

2 27 38 55 49 9 53 34

6. 5.4

7.

Question : 2.0

6.8

3.1

Question :

Find Q1, Q2, and Q3 for the data set below. 2.9

4.7

2.1

5.0

1.9

3.4

Which statement is true for a statistical study?

8. Question : The average amount customers at a certain grocery store spend yearly is $636.55. Assume the variable is normally distributed. If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.

9.

Question :

Which of the following is not a property of a normal distribution?

10. Question : The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed. If the standard deviation is $4.58, find the probability that a randomly selected employee earns less than $5.43.

11. Question : and the y values.

Use a scatter plot to deternine the relationship between the x values

12. Question : percentile rank.

If a student's rank in a class of 400 students is 44, find the student's

13. Question : Fran's percentile rank on an exam in a class of 500 is 85. Kelly's class rank is 60. Who is ranked higher?

14. Question : The area under a normal distribution curve that lies within one standard deviation of the mean is approximately ___.

15. 1.03.

Question :

Find the area under the normal distribution curve to the right of z = â€“

16. 3.24.

Question :

Find the area under the normal distribution curve to the right of z = â€“

17. Question : Armia's percentile rank on an exam in a class of 300 is 85. Sanjo's class rank is 42. Who is ranked higher?

18. Question : Determine whether a correlation coefficient of r = â€“0.405 is significant at the 5% level for a sample size of 22.

19.

Question :

Find the standard deviation.

44 46 33 10 50 27

20.

Question :

Find the median and the mean for the data set below.

5.4 2.0 6.8 3.1 2.9 4.7 2.1 5.0 1.9 3.4