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the definition of random sampling

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the definition of random sampling
需要英文解释
andom sampling - the selection of a random sample; each element of the population has an equal chance of been selected
或者
A selection of elements by a formal randomizing device for purposes of inference about a population of inference from that population in such a way that the probability of each possible outcome may be precisely specified in advance; the inferences are necessarily stochastic.(这个貌似更标准些:)