In stratified random sampling, the main advantage over simple random sampling is:
- A It ensures proportional representation of subgroups and reduces sampling error within strata ✓
- B It requires a smaller total sample size for similar precision
- C It eliminates interviewer bias completely
- D It allows sequential determination of sample size
Correct answer: A. It ensures proportional representation of subgroups and reduces sampling error within strata
Explanation
Stratified random sampling divides the population into homogeneous subgroups (strata) before sampling, ensuring all subgroups are represented proportionally and reducing variance within each stratum, thereby improving estimate precision. Sequential determination of sample size relates to sequential analysis in clinical trials, not stratified sampling.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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