MCAT Math Question 20: Answer and Explanation
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Question: 20
5. A cross-sectional study in which current smoking status and cancer history are assessed simultaneously cannot satisfy which of Hill's criteria?
- A. Strength
- B. Coherence
- C. Plausibility
- D. Temporality
Correct Answer: D
Explanation:
Because both the exposure and outcome are measured at the same time, we cannot make any conclusions about temporality. The cancer patient may have only begun smoking after diagnosis, and this type of study doesn't examine that possibility.