Suppose you want to use a paired t test to determine if the population means of before-and-after measurements are different, and you plan to use samples of size 45.What number of degrees of freedom should you use?
A) 90
B) 89
C) 45
D) 44

Question

Quizplus · Accepted Answer

When using a paired t test, the degrees of freedom are calculated as n-1, where n is the sample size. Since we have a sample size of 45, we should use 45-1=44 degrees of freedom. Therefore, the correct answer is D, 44.

Suppose You Want to Use a Paired T Test to Determine