A researcher selects a sample from a population with μ = 30 and uses the sample to evaluate the effect of a treatment.After treatment,the sample has a mean of M = 32 and a variance of s² = 6.If Cohen's d is used to measure the size of the treatment effect,which of the following would have no effect on the value of Cohen's d?
A)Increase the sample size
B)Increase the sample mean
C)Increase the sample variance
D)All of the other options will influence the value of Cohen's d.

Question

Quizplus · Accepted Answer

Cohen's d is calculated as the difference between the means divided by the standard deviation. Increasing the sample size does not affect the mean or standard deviation directly, thus it does not affect Cohen's d.

A Researcher Selects a Sample from a Population with μ