A researcher attempts to study the effect of fear arousal on attitude change. One group experiences no fear while the other group experiences a very high level of fear. Results show no difference in the amount of attitude change in the two groups. Which of the following should have been used in the research?
A. a less reliable measure of attitude change
B. a single level of the independent variable
C. a stronger manipulation of fear
D. a third group with a moderate level of fear
Answer: D
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