A sample of n 5 9 scores is selected from a population with a mean of m

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A sample of n 5 9 scores is selected from a population with a mean of m 5 80 and s 5 12, and a treatment is administered to the sample. After the treatment, the researcher measures effect size with Cohen’s d and obtains d 5 0.25. What was the sample mean?

a. M 5 81

b. M 5 82

c. M 5 83

d. M 5 84

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