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


Answer: C

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