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(Statistics) statistics a sample that is not drawn at random from the whole population, but separately from a number of disjoint strata of the population in order to ensure a more representative sample. See also frame13
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|Noun||1.||stratified sample - the population is divided into strata and a random sample is taken from each stratum|
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
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