Stats Exam 5
Question 1 of 10
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.
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.