Which sampling method is MOST appropriate when a researcher wants to ensure equal representation from each of 5 geographical zones, and from each zone selects individuals using a random process?
- A Simple random sampling
- B Stratified random sampling ✓
- C Systematic random sampling
- D Cluster sampling
Correct answer: B. Stratified random sampling
Explanation
Stratified random sampling divides the population into homogeneous subgroups (strata — here geographical zones) and randomly samples from each stratum, ensuring proportional or equal representation. Simple random sampling does not guarantee representation from each zone. Systematic sampling selects every nth individual from a list. Cluster sampling randomly selects entire clusters rather than individuals.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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