In an evaluation of an intervention that seeks to reduce depression scores among the frail elderly, the mean of the experimental group is 30, the mean of the control group is 60, and the standard deviation is 10. Cohen's d effect size is
A) 3
B) minus 3
C) 30
D) 10

Question

In an evaluation of an intervention that seeks to reduce depression scores among the frail elderly, the mean of the experimental group is 30, the mean of the control group is 60, and the standard deviation is 10. Cohen's d effect size is​
A) ​3
B) ​minus 3
C) ​30
D) ​10

Quizplus · Accepted Answer

Cohen's d is calculated as the difference between the means of two groups divided by the standard deviation. Here, (60 - 30) / 10 = 3.

In an Evaluation of an Intervention That Seeks to Reduce