If an effect is significant but the effect size for the difference between the two means is medium (according to Cohen's conventions), about how much overlap will there be between the two distributions?
A) 99 percent
B) 85 percent
C) 67 percent
D) 53 percent

Question

Quizplus · Accepted Answer

According to Cohen's conventions, a medium effect size corresponds to a Cohen's d of approximately 0.5. This means that the means of the two groups will differ by about half a standard deviation, which results in approximately 67 percent overlap between the two distributions.

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