A sampling frame lists all 2,500 households in a district. Every 10th household is selected to form a sample of 250. This method is called:
- A Systematic random sampling ✓
- B Stratified random sampling
- C Cluster sampling
- D Multistage sampling
Correct answer: A. Systematic random sampling
Explanation
Systematic random sampling involves selecting every k-th unit from an ordered list, where k = population/desired sample size (2500/250 = 10). The first unit is randomly chosen within the first interval (1–10), then every 10th unit thereafter. This is different from simple random sampling (each unit has equal independent probability), stratified sampling (population divided into strata), cluster sampling (entire groups selected), and multistage (sequential sampling at different levels).
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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