You plan to conduct a study where your nondirectional hypothesis ...

[cnetterville]

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

[sokh]

Answer to Question 1

D

Answer to Question 2

B