In stratified random sampling for a TB survey across 5 districts, the number sampled from each district is proportional to its population size. This method is called:

• A Proportionate stratified sampling ✓
• B Systematic random sampling
• C Cluster sampling
• D Disproportionate stratified sampling

Explanation

Proportionate stratified sampling allocates sample size from each stratum in direct proportion to that stratum's share of the total population, ensuring proper representation of all subgroups without over- or under-sampling. Disproportionate sampling deliberately varies allocation (used for rare subgroups). Cluster sampling selects entire naturally occurring groups rather than individuals from within strata, and is less precise but more feasible for large geographic surveys.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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