Suppose you carry out a study using a t test for independent means. The number of participants in each group is 40 and you conduct a one-tailed test. What would be the approximate level of power if you anticipated a medium effect size? (Consult the power table 9-4.)
A) .07
B) .72
C) .97
D) .29

Question

Quizplus · Accepted Answer

According to Table 9-4, with 40 participants in each group, a one-tailed test, and a medium effect size, the power is approximately .72.

Suppose You Carry Out a Study Using a T Test