If we are testing for the difference between the means of two paired 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

In paired samples, the degrees of freedom (df) are calculated based on the number of pairs minus one. Since there are 20 pairs (n1 = n2 = 20), the degrees of freedom are 20 - 1 = 19.

If We Are Testing for the Difference Between the Means