# Stats Exam 5

1.0 Points

A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. Using = .05, what is the value the test statistic? Women

Men

Sample size

50

80

Mean effect

7

6.95

Sample variance

3

4

A. t = 3.252

B. z = 0.455

C. z = 0.081

D. z = 0.151

Answer Key: D

Question 2 of 10

1.0 Points A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the .10 level of significance, that

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B. Yes

C. Cannot Determine

Answer Key: A

Question 8 of 10

1.0 Points

The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. Use these data to answer questions 8 through 10. Store

1

2

3

4

5

6

Shelf Space

5

5

5

10

10

10

Weekly Sales

1.6

2.2

1.4

1.9

2.4

2.6 Store

7

8

9

10

11

12

Shelf Space

15

15

15

20

20

20

Weekly Sales

2.3

2.7

2.8

2.6

2.9

3.1

Compute the value of the sample correlation coefficient between weekly sales and shelf space.

A. 0.684

B. 0.827

C. 0.652

D. 0.308

Answer Key: B

Question 9 of 10

1.0 Points

The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. Use these data to answer questions 8 through 10. Store

1

2

3

4

5

6

Shelf Space

5

5

5

10

10

10

Weekly