Find the test statistic value for two mean tests in large sample.
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to find out whether there is a difference between the effectiveness for women and for men. At α = .05, what is the test value?

Women

Men

Sample size

40

70

Mean effect

7

6.75

Sample variance

2.5

4.5

a. 0.70
b. 1.97
c. 0.36
d. 1.42