MCAT Math Question 17: Answer and Explanation

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Question: 17

2. Which of the following would best establish a causal link?

  • A. A cross-sectional study using survey data for hand-washing and colds.
  • B. A case–control study of an exposure during childhood and development of a certain disease later in life.
  • C. A randomized clinical controlled trial of a new antipyretic drug.
  • D. An IQ test where the results are later segregated by gender.

Correct Answer: C

Explanation:

An experiment will always establish a clearer causal link than an observational study. Choices (A), (B), and (D) are all examples of observational data.

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