Biostatistics & Research · single question
Which study type is considered interventional?
Show answer and explanation
Correct answer: D. Randomized controlled trial
A randomized controlled trial (RCT) is interventional — the researcher randomly assigns participants to intervention or control groups.
- A. ❌ Cohort studies are observational; participants are followed without intervention.
- B. ❌ Case-control studies are retrospective and observational.
- C. ❌ Cross-sectional studies are observational snapshots.
- D. ✅ CORRECT – RCTs are interventional; participants are randomly assigned to receive/not receive an intervention.
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