If we are testing for the difference between the means of two related populations with samples of n₁ = 20 and n₂ = 20, the number of degrees of freedom is equal to
A) 39.
B) 38.
C) 19.
D) 18.

Question

Quizplus · Accepted Answer

When testing for the difference between means of two related populations, we use a paired t-test. The formula for degrees of freedom in a paired t-test is df = n - 1, where n is the sample size of the paired data. Therefore, the number of degrees of freedom in this scenario is 20-1 = 19. So, the correct answer is C.

If We Are Testing for the Difference Between the Means