A health worker randomly selects one household from each street and then surveys all eligible people in the selected households. Which sampling method is most closely described?
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 households or villages, and studies members within the selected groups. Systematic sampling selects individuals at a fixed interval from an ordered 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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