A researcher randomly selects several villages and surveys every household within each selected village. Which sampling method is being used?
Correct answer: D. Cluster sampling
- A. Stratified random sampling
- B. Convenience sampling
- C. Systematic random sampling
- D. Cluster sampling
Explanation
Cluster sampling selects groups, such as villages, and studies units within the selected groups. Stratified sampling instead samples units from every relevant subgroup.
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About Sampling and Estimation
Sampling covers population and sample, sampling frames, simple random, systematic, stratified, cluster and convenience methods, along with sampling and non-sampling errors. Estimation includes sample statistics, population parameters, point estimates, confidence intervals and margins of error, with attention to how sample size affects precision.
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