A sample is selected from a population with μ = 46,and a treatment is administered to the sample.After treatment,the sample mean is M = 48 with a sample variance of s² = 16.Based on this information,what is the value of Cohen's d?
A)d = 0.125
B)d = 0.25
C)d = 0.50
D)Cohen's d cannot be computed without knowing the sample size.

Question

Quizplus · Accepted Answer

Cohen's d is calculated as the difference between the means divided by the standard deviation of the population. The difference between the sample mean and population mean is 2 (48-46), and the standard deviation of the population is the square root of the variance, which is 4. Therefore, Cohen's d is 2/4 = 0.50.

A Sample Is Selected from a Population with μ =