In statistics, a simple random sample is a subset of individuals (a sample) chosen from a larger set (a population). Each individual is chosen randomly and entirely by chance, such that each individual has the same probability of being chosen at any stage during the sampling process, and each subset of k individuals has the same probability of bei...
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http://en.wikipedia.org/wiki/Simple_random_sample
(from the article `statistics`) ...sample has been taken. The key characteristic of a probability sample is that each element in the population has a known probability of being ... Simple random sampling provides the basis for many probability sampling methods. With simple random sampling, every possible sample of size has the ... [...
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http://www.britannica.com/eb/a-z/s/98
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