The degrees of freedom for the related samples t test is the number of pairs of participants minus one,and not always the total number of participants minus one.

Question

Quizplus · Accepted Answer

The degrees of freedom for the related samples t test is based on the number of pairs of participants, as each pair represents a single source of variation in the difference scores between the two related samples. Therefore, the degrees of freedom is equal to the number of pairs minus one. This is different from the independent samples t test, where the degrees of freedom is based on the total number of participants in both groups minus two.

The Degrees of Freedom for the Related Samples T Test