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proportional sampling

n.
1.the population is divided into subpopulations (strata) and random samples are taken of each stratum

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    Idiom of the Day

    throw up one's hands (in defeat)
    to give up trying, to admit that one cannot succeed
    The professor threw up his hands and decided to let the students go home early.



    1.
    Choose an idiom to replace the expression in the brackets:
    The business trip to New York City was a (rare chance) to gain new experience.

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