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

When comparing the means of related populations with samples of equal size, the degrees of freedom can be calculated by df = n - 1, where n is the sample size. So, in this case, the degrees of freedom would be 20-1=19 for each of the two samples, giving a total of 2*19=38 degrees of freedom for the entire test. Therefore, the correct answer is C, with 19 degrees of freedom for each sample.

If We Are Testing for the Difference Between the Means