The actual amount of difference that exists between the two populations with unknown means (which you sample from) is the issue of
A) critical value
B) effect size
C) one- or two-tailed tests
D) significance level.

Question

Quizplus · Accepted Answer

Effect size is a quantitative measure of the magnitude of the experimenter effect. It specifically addresses the question of how much difference exists between two populations, beyond just the statistical significance of the difference.

The Actual Amount of Difference That Exists Between the Two