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 men. At a = 0.05, what is an appropriate test value? Women Men Sample size 70 80 Mean effectiveness 7.4 7.7 Population variance 3.6 5.1 options:

-2.60

0.34

-1.13

-0.88