Question: Given the following values for an undesirable outcome variable such as number of incidents of verbal abuse, the Cohen's d effect size is: Experimental group

Given the following values for an undesirable outcome variable such as number of incidents of verbal abuse, the Cohen's d effect size is:

Experimental group mean = 5

Control group mean = 8

Standard deviation = 2

a. + 3.0

b. - 3.0

c. + 1.5

d. - 1.5

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