A sample of n 5 25 is selected from a population with m 5 40, and a

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A sample of n 5 25 is selected from a population with m 5 40, and a treatment is administered to each individual in the sample. After treatment, the sample mean is M 5 44 with a sample variance of s 2 5 100.

Based on this information, what is the size of the treatment effect as measured by Cohen’s d?

a. d 5 0.04

b. d 5 0.40

c. d 5 1.00

d. d 5 2.00

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