Which statement is only true for the t test for dependent means rather than t tests in general?
A)Population variances are estimated from the information in the sample of scores actually studied.
B)Pretest-posttest experimental designs are common.
C)The population means are unknown.
D)The sample scores (in some form)are compared to a t distribution.

Question

Quizplus · Accepted Answer

Pretest-posttest experimental designs are specific to the t test for dependent means, as this type of test is used to compare the means of two related or paired samples (i.e. pretest and posttest scores). A and D are true for all types of t tests, while C is not necessarily true as the population means may be known in some situations.

Which Statement Is Only True for the T Test for Dependent