Definition:Simple Random Sample
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Let $P$ be a population.
Let $S \subsetneq P$ be a sample.
- Every individual in $P$ had an equal chance of being selected to be in $S$;
- Every $n$-combination of $P$ had an equal chance of being constructed as a potential $S$.
Also known as
A simple random sample is also called a random sample if there is no danger of ambiguity.