A Lady Health Worker selects every tenth household from an ordered list after choosing a random starting point. Which sampling method is used?
Correct answer: B. Systematic sampling
- A. Convenience sampling
- B. Systematic sampling
- C. Purposive sampling
- D. Cluster sampling
Explanation
Systematic sampling selects units at a fixed interval after a random start. Convenience sampling uses easily available participants, while purposive sampling depends on the researcher's judgment.
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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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