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)d=0.001

Question

Quizplus · Accepted Answer

Cohen's d is calculated by dividing the difference between the sample mean and population mean by the standard deviation. The formula is:

d = (M - μ) / s

In this case, M = 48 and μ = 46, so the numerator is 2. The denominator is the sample standard deviation, which can be found by taking the square root of the sample variance:

s = √16 = 4

Thus, d = 2 / 4 = 0.5.

Therefore, the correct answer is C.

​A Sample Is Selected from a Population with μ =

A Sample Is Selected from a Population with μ =