A researcher divides a village into numbered sections, randomly selects three sections, and surveys every household in those selected sections. Which sampling method is being used?
Correct answer: A. Cluster sampling
- A. Cluster sampling
- B. Systematic sampling
- C. Convenience sampling
- D. Purposive sampling
Explanation
Cluster sampling selects naturally occurring groups, such as village sections, and then studies members within the selected groups. Systematic sampling selects individuals at a fixed interval from a list.
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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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