If a sample has a mean of = 107 and a standard deviation of s = 7 and the population mean is µ = 107, what is Cohen’s d?
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A researcher conducted a one-sample z-test, and found a significant effect with the sample mean equaling 24 (n = 20), the population mean equaling 19, and the population standard deviation equaling 5. What is the effect size using Cohen’s d? [G&W Chp. 8] Cohen’s d equals 0.33 Cohen’s d equals 0.66 Cohen’s d equals 1.00 Cohen’s d does NOT equal any of the above values.
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