A sample is selected from a population with ? = 70,and a treatment is administered to the sample.After treatment,the sample mean is M = 74,and Cohen's d is d = 1.00.What is the value of the sample variance? A)s² = 2 B)s² = 4 C)s² = 16 D)It is impossible to determine the sample variance without more information.

Question

Quizplus · Accepted Answer

Cohen's d is defined as d = (M - μ) / s, where s is the standard deviation of the sample. Rearranging this equation, we can solve for s: s = (M - μ) / d. 
Plugging in the given values, we get s = (74 - 70) / 1.00 = 4. 
The sample variance is equal to s^2, so we get s^2 = 4^2 = 16. Therefore, the answer is (C).

A Sample Is Selected from a Population with ? =