A researcher deliberately selects Lady Health Workers who have worked for at least five years to explore their experiences of community mobilisation. Which sampling method is being used?
Correct answer: A. Purposive sampling
- A. Purposive sampling
- B. Simple random sampling
- C. Systematic sampling
- D. Cluster sampling
Explanation
Purposive sampling deliberately selects people who meet characteristics relevant to the research question. Random sampling gives each eligible person a known chance of selection, whereas systematic and cluster sampling use structured selection procedures.
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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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