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Data & Analytics · Foundational

Simple Random Sampling (SRS)

A sampling method in which every member of the population has an equal chance of being selected.

Definition

SRS gives unbiased estimates but needs a complete sampling frame and may under-represent small subgroups by chance; stratified sampling addresses that.

Example

SELECT * FROM customers ORDER BY RANDOM() LIMIT 1000;

Exam tip

Equal chance for every member = simple random sampling.

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