Calculating Sample Size G Power. A Run a-c as above b Enter Effect size guess in the Effect size d box small02 medium05 large08 c Hit Calculate on the main window d Find Total sample size in the Output Parameters Numeric. Small effect size 15 005 significance 80 power and 4 predictors.
Wilcoxon-Mann-Whitney test two groups. Since my main hypothesis revolves around interaction terms I am using ANCOVA in GPower analysis to calculate the required sample size. Small effect size 15 005 significance 80 power 30 groups.
Minimum recommended sample size is 85.
It goes hand-in-hand with sample size. Under the Statistical test drop-down menu select Means. Using GPower to Determine Sample Size. Small effect size 15 005 significance 80 power 30 groups.
