A sample of difference scores has a mean of MD = 5 with a variance of s² = 100.If effect size is measured using Cohen's d,what is the value of d?
A)5/10
B)5/100
C)25/100
D)Cannot determine without knowing the sample size

Question

Quizplus · Accepted Answer

Cohen's d is calculated as the mean difference (MD) divided by the standard deviation (s). The standard deviation is the square root of the variance, so s = sqrt(100) = 10. Therefore, d = 5 / 10.

A Sample of Difference Scores Has a Mean of MD