In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?
A)a test of the equality of variances from 2 independent populations
B)a test of the difference between the means of 2 related populations
C)a test of the difference between the means of 2 independent populations
D)a test for of equality of variances from two related populations.

Question

Quizplus · Accepted Answer

In a test of the difference between the means of 2 related populations, such as a paired t-test, the variable of interest is the difference between the values of the paired observations, rather than the observations themselves. Choices A and D are tests of variances, not means, and do not involve looking at the differences between observations. Choice C is a test of the means of two independent populations, but does not necessarily involve looking at the differences between observations.

In What Type of Test Is the Variable of Interest