Suppose you are planning a study involving three groups and you expect a large effect size (and will use the .05 level). For 80% power, how many participants will you need in total?
A)52
B)18
C)63
D)156

Question

Quizplus · Accepted Answer

For a study with three groups, expecting a large effect size, and aiming for 80% power at the .05 significance level, a total of 63 participants is typically needed. This calculation is based on standard power analysis methods for comparing means across groups, taking into account the desired power level, effect size, and alpha level.

Suppose You Are Planning a Study Involving Three Groups and You