When comparing the difference between means for two distributions, what happens to the effect size if the variability within each distribution becomes smaller?
A) There is no change in the effect size.
B) The effect size decreases.
C) The effect size increases.
D) It is not possible to find based the information provided.

Question

Quizplus · Accepted Answer

When the variability within each distribution becomes smaller, the effect size increases because the means of the distributions become more distinct relative to the variability, making any difference between them more pronounced.

When Comparing the Difference Between Means for Two Distributions, What