A researcher working in a Human Resources department was interested in gender and sales figures so he conducted a t-test. The mean for males was 66.25 and the mean for females was 78.24, with both groups having a standard deviation of 7. What is the effect size using Cohen's d?
A) 1.7
B) 0
C) 1.712
D) -1.712

Question

Quizplus · Accepted Answer

Cohen's d is calculated by taking the difference between the two means and dividing by the pooled standard deviation.

d = (78.24 - 66.25) / (sqrt(((7^2)+(7^2))/2)))

d = 1.712

Therefore, the effect size using Cohen's d is 1.712.

A Researcher Working in a Human Resources Department Was Interested