In a village survey, households are selected by first dividing the village into 10 blocks, then randomly selecting 5 households from each block. This sampling method is called:
- A Systematic random sampling
- B Stratified random sampling ✓
- C Cluster sampling
- D Quota sampling
Correct answer: B. Stratified random sampling
Explanation
Stratified random sampling involves dividing the population into subgroups (strata) based on a characteristic and then randomly sampling from each stratum — ensuring representation from all strata. Cluster sampling selects entire clusters (e.g., villages) randomly. Systematic sampling uses a fixed interval. Quota sampling is non-probability sampling where interviewers fill predetermined quotas.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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