If an effect is significant but the effect size for the difference between the two means is small (according to Cohen's conventions), about how much overlap will there be between the two distributions?
A) 99 percent
B) 85 percent
C) 50 percent
D) 15 percent

Question

Quizplus · Accepted Answer

When the effect size for the difference between two means is small according to Cohen's conventions, there is still a considerable amount of overlap between the two distributions, approximately 85 percent. This indicates that despite the statistical significance, the practical difference between the groups might be minimal.

If an Effect Is Significant but the Effect Size for the Difference