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一、简单随机抽样一般地,设一个总体含有有限个个体,并记其个体数为N。如果通过逐个抽取的方法从中抽取一个样本,且每次抽取时各个个体被抽到的概
First, a simple random sampling In general, set an overall contains a limited number of individuals, and remember that the number of individuals as N. If one sample is drawn from one by one and each individual is drawn