A researcher selects participants because they possess specific expertise required for a study. Which sampling method is being used?
Correct answer: C. Purposive sampling
- A. Stratified sampling
- B. Systematic sampling
- C. Purposive sampling
- D. Convenience sampling
Explanation
Purposive sampling deliberately selects units with particular characteristics or knowledge relevant to the research. Systematic and stratified sampling use structured random selection, while convenience sampling relies mainly on availability.
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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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