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 the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?

Pine trees

Spruce trees

Sample size

40

70

Mean trunk diameter (cm)

45

39

Sample variance

100

150

A. The data do not support the claim because the test value 1.29 is greater than 1.28.

B. The data support the claim because the test value 2.78 is greater than 1.28.

C. The data support the claim because the test value 2.78 is greater than 1.64.

D. The data do not support the claim because the test value 1.29 is less than 1.64.

Answer Key: B

Question 3 of 10

1.0 Points

A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business lunches was $0.87. What is the test value?

A. 3.10

B. 9.61

C. 49.50

D. 7.03

Answer Key: D

Question 4 of 10

1.0 Points

Members of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students produced the results given in the table below.