In Cohen's d, the closer together the means of two distributions, the _____ the effect size, assuming the standard deviation is held constant.
A) more variable
B) less variable
C) higher
D) lower

Question

Quizplus · Accepted Answer

Cohen's d measures the standardized difference between two means. When the means are closer together, the difference between them is smaller (numerator of the equation), resulting in a smaller Cohen's d value, indicating a lower effect size. Therefore, the answer is D) lower.

In Cohen's D, the Closer Together the Means of Two