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简单随机抽样、系统抽样、分层抽样的共同特点是不放回抽样,且各个体被抽取的概率相等,均为Nn(N为总体个数,n为样本容量),系统抽样、分层抽样的实质分别是等距离抽样与按比例抽样,只需按照其定义、适用范围和抽样步骤进行,就可得到符合条件的样本.高考常结合应用问题,考查构造?
The common characteristics of simple random sampling, systematic sampling, and stratified sampling are that the sampling is not replaced, and the probabilities of each body are equal, both Nn (N is the total number, n is the sample size), systematic sampling, stratified sampling The essence of the two methods is equal distance sampling and proportional sampling. According to their definition, application scope and sampling procedures, they can obtain samples that meet the conditions.