When statisticians talk about effect size, they are referring to
A) the probability of a Type II error
B) whether the significance level was large or small
C) whether the$\alpha$ level was large or small
D) the difference between the means of the two populations the samples are from.

Question

Quizplus · Accepted Answer

Effect size refers to the magnitude of the difference between the means of two populations from which samples are drawn. It quantifies the size of the difference rather than just indicating whether the difference is statistically significant.

When Statisticians Talk About Effect Size, They Are Referring to α\alphaα

When Statisticians Talk About Effect Size, They Are Referring to $\alpha$