A researcher selects every 20th patient from the outpatient department register after a random start. This sampling method is best described as:

• A Simple random sampling
• B Systematic random sampling ✓
• C Stratified random sampling
• D Multistage sampling

Explanation

Systematic random sampling involves selecting every kth unit from a list after a random start. Here, every 20th patient is selected, which is the defining characteristic. Simple random sampling requires each unit to be independently chosen with equal probability. Stratified sampling divides the population into subgroups first. Multistage sampling involves multiple rounds of sampling at different levels.

Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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