Question: A sample is selected from a population with a mean of m 5 75, and a treatment is administered to the individuals in the sample.

A sample is selected from a population with a mean of m 5 75, and a treatment is administered to the individuals in the sample. The researcher intends to use a t statistic to evaluate the effect of the treatment. If the sample mean is M 5 79, then which of the following outcomes would produce the largest value for Cohen’s d?

a. n 5 4 and s 2 5 30

b. n 5 16 and s 2 5 30

c. n 5 25 and s 2 5 30

d. All three samples would produce the same value for Cohen’s d.

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