Interaction Effects Occur When

question 70

Multiple Choice

Interaction effects occur when

• A)there is an imbalance in the experimental and control group at the beginning of an experiment during the pretest.
• B)there is experimenter expectancy and there is a diffusion of the treatment at the same time.
• C)external validity and reactivity cannot be controlled by a double-blind experimental design.
• D)in a factorial design,the impact of two variables operating in combination is greater than each of them added together.
• E)instrumental effects cause history effects to get larger and ruin the post-test.