Suppose the effects of a treatment are tested in two different experiments. Experiment A consists of a pretest-posttest, control group design; experiment B consists of a posttest-only, control group design. The treatment is found to have an effect only in experiment A.
A One possible explanation of the discrepancy in findings is the effects of __________ in experiment
A) selection
B) testing
C) testing-X interaction
D) statistical regression
E) attrition

Question

Suppose the effects of a treatment are tested in two different experiments. Experiment A consists of a pretest-posttest, control group design; experiment B consists of a posttest-only, control group design. The treatment is found to have an effect only in experiment A.
A One possible explanation of the discrepancy in findings is the effects of __________ in experiment
A) selection
B) testing
C) testing-X interaction 
D) statistical regression
E) attrition

Quizplus · Accepted Answer

The testing-X interaction refers to the interaction between the pretest and the treatment, which can affect the outcome in a pretest-posttest design like experiment A. This interaction is absent in a posttest-only design like experiment B, potentially explaining the discrepancy in findings.

Suppose the Effects of a Treatment Are Tested in Two