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  1. Oxford American Dictionary

    stratified sample

    • IPA[ˌstradəˌfīd ˈsamp(ə)l]

    美式

    • n.
      a sample that is drawn from a number of separate strata of the population, rather than at random from the whole population, in order that it should be representative.

    • noun: stratified sample, plural noun: stratified samples