For a maternal health survey, a researcher divides women into urban and rural groups, then randomly selects participants from each group. Which sampling method is used?
Correct answer: A. Stratified random sampling
- A. Stratified random sampling
- B. Cluster sampling
- C. Purposive sampling
- D. Snowball sampling
Explanation
Stratified sampling first divides the population into important subgroups and then samples from each subgroup. Cluster sampling selects whole groups such as villages, rather than individuals from every subgroup.
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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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