You wish to conduct an ANOVA one wayomnibus in your ASCI 691

You wish to conduct an ANOVA (one way/omnibus) in your ASCI 691 capstone project. In order to insure you have enough power to detect differences in your sample, you need to run a power analysis in G*Power. Assume that you are expecting a medium effect size, ? = 0.05, and a minimum power of 0.80. Your experiment utilizes three (3) groups. What is the required sample size (a priori)? How many data points should exist in each group

Solution

Entering all the parameters into GPower, you need a total sample size of 159. This means there should be 53 in each group.