Biostatistics & Research · single question
Which is NOT an interventional study?
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Correct answer: A. Observational study
- A. An OBSERVATIONAL study is NOT interventional — the researcher observes subjects WITHOUT manipulating or intervening. Types of observational studies: cohort, case-control, cross-sectional. In contrast, INTERVENTIONAL (experimental) studies involve the researcher actively manipulating the exposure: RCT, clinical trials. The INBDE commonly tests this distinction.
- B. A clinical trial IS interventional — it tests treatments or interventions.
- C. An RCT IS interventional — the researcher randomly assigns subjects to treatment or control conditions.
- D. An experimental study IS interventional by definition — the researcher manipulates the independent variable.
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