You plan to conduct a study where your nondirectional hypothesis will be assessed with a t test for independent means at the .05 significance level.
If you are predicting a large effect size, how many participants would you need in total (assuming equal Ns per group) to obtain 80 power?
A) 20
B) 26
C) 40
D) 52
Question 2
You plan to conduct a study where your directional hypothesis will be assessed with a t test for independent means at the .05 significance level.
Assuming that you will recruit 50 participants per group and predict a small effect size, how much power will your study have?
A) .17
B) .26
C) .29
D) .41
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