In what way does high within-groups variance obscure between-groups variance?
A) It leads to smaller effect sizes.
B) It limits the type of statistical analyses that can be conducted.
C) It causes more overlap between experimental/comparison groups.
D) Both a and c obscure between-group variance.
E) Both b and c obscure between-group variance.

Question

Quizplus · Accepted Answer

High within-groups variance makes it more difficult to detect clear differences between experimental and comparison groups, which can lead to smaller effect sizes and more overlap between groups.

In What Way Does High Within-Groups Variance Obscure Between-Groups Variance