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Nov 9, 2009
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strat'ified ran'dom sam'ple



Statistics.
a random sample of a population in which the population is first divided into distinct subpopulations, or strata, and random samples are then taken separately from each stratum.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

stratified charge enginestratiform
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