A sample is selected from a population with μ = 46 and a treatment is administered to the sample.After treatment, the sample mean is M = 48 with a sample variance of s² = 16.Based on this information, the size of the treatment effect, as measured by Cohen's d, is ____. A)d = 0.125 B)d = 0.25 C)d = 0.50 D)Cohen's d cannot be computed without knowing the sample size.

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Quizplus · Accepted Answer

Cohen's d is calculated as the difference between the sample mean and the population mean divided by the standard deviation. Here, d = (48 - 46) / 4 = 0.50.

A Sample Is Selected from a Population with μ =