You do a t test for dependent means in exactly the same way as a t test for a single sample, except that you use something called:
A)the mean variance
B)variance of the dependent means
C)difference scores
D)independent t scores

Question

Quizplus · Accepted Answer

In a t test for dependent means, we compute the difference between each pair of scores (before and after in the same individual) to get the difference scores. We then calculate the mean of these difference scores and perform a t test on this mean to determine whether the mean difference is significantly different from zero. Therefore, we use difference scores in a t test for dependent means.

You Do a T Test for Dependent Means in Exactly