A sample of n = 9 individuals is selected from a population with μ = 60 and σ = 6,and a treatment is administered to the sample.After treatment,the sample mean is M = 63.What is the value of Cohen's d for this sample?
A)0.33
B)0.50
C)1.00
D)2.00

Question

Quizplus · Accepted Answer

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

d = (M - μ) / σ

Plugging in the values from the problem:

d = (63 - 60) / 6 = 0.50

Therefore, the answer is B) 0.50. This indicates a medium effect size, meaning that the treatment had a moderate impact on the sample.

A Sample of N = 9 Individuals Is Selected from a Population