Praxis Biology 5236 Practice Questions - Praxis Biology Content Knowledge (5236) Exam

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A researcher measures blood pressure in 500 patients over one year and finds that those who exercise more have lower blood pressure. She concludes that exercise lowers blood pressure. What is the main limitation of this conclusion?

The sample size of 500 is too small to draw any conclusion Correlation between exercise and blood pressure does not establish that exercise causes lower blood pressure Blood pressure cannot be measured accurately outside of a clinical trial The study lasted only one year, making all findings invalid

Correct Answer:

Correlation between exercise and blood pressure does not establish that exercise causes lower blood pressure

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