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) 38. B) 39. C) 18. D) 19.

Question

Quizplus · Accepted Answer

The formula for the degrees of freedom in a paired t-test is df = n-1, where n is the number of pairs. In this case, there are 20 pairs, so the degrees of freedom is 20-1 = 19. Therefore, the correct choice is D.

If We Are Testing for the Difference Between the Means