An effect size index is most closely associated with which phrase below?
A) the $\alpha$ level chosen by the researcher
B) the probability of a Type II error
C) the size of the difference between the sample mean and the null hypothesis mean
D) the size of the rejection region.

Question

Quizplus · Accepted Answer

An effect size index measures the magnitude of the difference between groups or variables, which is most closely related to the size of the difference between the sample mean and the null hypothesis mean.

An Effect Size Index Is Most Closely Associated with Which α\alphaα

An Effect Size Index Is Most Closely Associated with Which $\alpha$