A researcher administers a treatment to a sample of n = 16 selected from a population with µ = 40 and Ϭ = 8.If the sample mean after treatment is M = 42,then Cohen's d = 1.00.

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Cohen's d is calculated as the difference between the sample mean and the population mean, divided by the population standard deviation. In this case, Cohen's d = (42 - 40) / 8 = 0.25.

A Researcher Administers a Treatment to a Sample of N