The Difference Between the Values of Degrees of Freedom for One

Multiple Choice

The difference between the values of degrees of freedom for one sample t tests and related means t tests is that

A) related means t tests have a df = N - 2, where N is the number of pairs of scores.
B) related means t tests have a df = N, where N is the number of pairs of scores.
C) related means t tests have a df = N - 1, where N is the number of pairs of scores.
D) one sample t tests have a df = N - 2, where N is the total number of raw scores.