Nonindependent t-tests are used when
A) the two groups tested are randomly formed samples.
B) the two groups tested are initially the same on the dependent variable.
C) the two groups are formed by preexisting samples.
D) Matching has been done or in a pre-post design.

Question

Quizplus · Accepted Answer

Nonindependent t-tests are used when there is some form of dependency between the two groups being compared. This can occur in a pre-post design, where the same individuals are measured before and after intervention, or in matched groups where participants have been matched on important variables such as age or intelligence. In both cases, the dependence between the two groups means that a nonindependent t-test is required to compare them.

Nonindependent T-Tests Are Used When