A set of data about individuals or other entities of interest that is smaller than the population from which it is drawn. There are many ways in which this may be appropriately done, some involving replacement of subjects already drawn from the population (like drawing a number from a hat and then putting it back before drawing again), others not. See, for some common types of sample, Cluster Sample, Convenience Sample, Purposive Sample, Quota Sample, Random Sample, Sequential Sample, Stratified Sample.

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