Biostatistics & Research · single question
An investigator assigns participants to treatment or control by chance to test an intervention. This design is a:
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Correct answer: C. Randomized controlled trial
- A. A cohort study observes exposed vs unexposed groups without assigning exposure.
- B. A case-control study compares those with vs without an outcome, looking back at exposures.
- C. Correct. Random allocation to an intervention is the defining feature of an RCT—the gold standard for minimizing confounding.
- D. Cross-sectional studies measure exposure and outcome at one time point without intervention.
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