A researcher in a rural health centre writes the names of all eligible households on slips, mixes them, and draws 30 slips. Which sampling method is being used?
Correct answer: A. Simple random sampling
- A. Simple random sampling
- B. Systematic sampling
- C. Stratified sampling
- D. Convenience sampling
Explanation
Each eligible household has an equal chance of selection when slips are mixed and drawn randomly. Systematic sampling selects at a fixed interval, while convenience sampling uses easily available participants.
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About Epidemiology and Biostatistics
Epidemiology examines the distribution and causes of disease by person, place and time, using measures such as incidence, prevalence, mortality and case-fatality rates. Biostatistics covers data presentation, sampling, averages, variability, probability and interpretation of study results, while distinguishing association from causation.
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