A researcher has children watch 30 minutes of violent television, and then counts the number of times they hit each other afterward in a one-hour play period as a measure of aggression. The researcher causes aggression, however this conclusion may be invalid because:
Correct answer: C. there was no control group
- A. all children are prone to aggressive behavior
- B. it is unethical to force children to watch violent television
- C. there was no control group
- D. aggression wasn't operationally defined
Explanation
Without a control group, the researcher cannot know whether hitting increased because of violent television or because of normal play, time, or other factors. Operationally defining aggression as the number of hits is appropriate here.
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