The following is/are true for the mixed ANOVA approach to analysis of a pretest-posttest design:
A) Meaningful analysis is dependent on a significant interaction between the treatment conditions and time
B) Tests of simple main effects must be done when there is a significant interaction
C) The treatment only can interact with the posttest
D) All of the above

Question

Quizplus · Accepted Answer

In a mixed ANOVA for a pretest-posttest design, a significant interaction between treatment conditions and time is crucial for meaningful analysis (A). When such an interaction is significant, tests of simple main effects are necessary to understand the nature of the interaction (B). The treatment can interact with the posttest, as it is part of the time factor in the design (C).

The Following Is/are True for the Mixed ANOVA Approach to Analysis