When people such as Cohen say that a medium size difference has an effect size of .50, they are saying that we want the power for
A) one mean being half as large as another.
B) one mean being half a point larger than another.
C) one mean being half a standard deviation larger than another.
D) one mean being based on half as many subjects as the other.

Question

Quizplus · Accepted Answer

Cohen's d is a measure of effect size that describes the difference between two means in terms of standard deviation, specifically the number of standard deviations that the means are apart. A medium effect size is generally considered to be around .50, which means that one mean is half a standard deviation larger than the other.

When People Such as Cohen Say That a Medium Size