In a community survey, households are first stratified by socioeconomic status, and then a random sample is drawn from each stratum. This type of sampling is called:
- A Stratified random sampling ✓
- B Cluster sampling
- C Systematic random sampling
- D Multistage sampling
Correct answer: A. Stratified random sampling
Explanation
Stratified random sampling divides the population into homogeneous subgroups (strata) and then randomly samples from each stratum. This improves representativeness compared to simple random sampling, especially for heterogeneous populations. Cluster sampling involves selecting intact groups; multistage sampling involves sampling at multiple hierarchical levels.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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