A researcher selects every 20th patient from the outpatient registration register after a random start. This is an example of which sampling method?

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

Explanation

Systematic random sampling involves selecting every kth unit after a random start. Here k = 20. Simple random sampling requires each unit to be independently selected with equal probability using random numbers. Stratified sampling divides the population into strata first. Multistage sampling involves multiple rounds of sampling at different levels.

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

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