Methods With stratified sampling and cluster sampling, we investigate 487 families in poverty.
方法采用分层整群抽样方法调查487户贫困家庭。
Methods An anonymous survey was conducted among 502 students from a technical college selected by stratified sampling and cluster sampling.
方法采用分层整群抽样的方法对一所职业技术学院的502名学生进行匿名式问卷调查。
This research adopts investigation methods of stratified sampling and cluster sampling, chooses 95 community health service organizations in 14 cities of Liaoning Province as a analysis sample.
采取分层整群抽样的调查方法，选取辽宁省14个市95家社区卫生服务机构作为分析样本。
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