To infer that an intervention is the real cause of a change:
- A .we must make sure that the change preceded the onset of the intervention
- B .it is sufficient to know that the intervention is correlated with the change.
- C .we must ascertain whether the change is correlated with the intervention, learn that it did not precede the intervention, and eliminate plausible alternative explanations for the change.
- D .rely on studies that avoided the use of random assignment to treatment conditions.
The correct answer is:
- C .we must ascertain whether the change is correlated with the intervention, learn that it did not precede the intervention, and eliminate plausible alternative explanations for the change.
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