If we are testing for the difference between the means of 2 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

The number of degrees of freedom for a paired t-test is equal to (n-1), where n is the sample size. Since the sample size for each group is 20, the total number of degrees of freedom is (20-1) = 19. Therefore, the best choice is C.

If We Are Testing for the Difference Between the Means