In what way does high within-groups variance obscure between-groups variance?
A)It leads to null results.
B)It leads to larger effect sizes.
C)It causes more overlap between experimental/comparison groups.
D)It limits the type of statistical analyses that can be conducted.

Question

Quizplus · Accepted Answer

When there is high within-groups variance, it causes more overlap between experimental and comparison groups. This overlap can obscure the differences in the means of the groups, making it difficult to detect significant between-groups variance. Therefore, it is essential to reduce the within-groups variance as much as possible to increase the power of the analysis.

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