A sample is selected from a population with μ = 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 can be calculated using the formula:

d = (M - μ) / s

where M is the sample mean, μ is the population mean, and s is the sample standard deviation.

Since d = 1.00, we can rearrange the formula to solve for s:

s = (M - μ) / d

Plugging in the given values, we get:

s = (74 - 70) / 1.00 = 4

We know that the sample variance is equal to the square of the sample standard deviation:

s^2 = 4^2 = 16

Therefore, the answer is choice C: s^2 = 16.

A Sample Is Selected from a Population with μ =