The number of degrees of freedom associated with the t-test, when the data are gathered from a matched pairs experiment with 10 pairs, is:
A) 10
B) 20
C) 9
D) 18
E) 14

Question

Quizplus · Accepted Answer

For a matched pairs experiment with n pairs, the number of degrees of freedom is (n-1). In this case, n=10 pairs, so the degrees of freedom would be (10-1) = 9. Therefore, the best choice is C.

The Number of Degrees of Freedom Associated with the T-Test