stratified random sampling method

基本解釋

Methods 3034 children between 0 to 6 years in three Gorges reservoir were selected by stratified random sampling method.
方法以分層整群隨機(jī)抽樣的方法選取三峽庫區(qū)0～6歲兒童3034例，采用骨源性堿性磷酸酶（BALP）測定。
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Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.
方法按照分層隨機(jī)抽樣原則隨機(jī)抽取部分食品從業(yè)人員，匿名獨(dú)自填寫統(tǒng)一的調(diào)查問卷。
Methods By using stratified random sampling method 524 college students were selected and surveyed with scales about sense of alienation and subjective well-being.
方法分層隨機(jī)抽取某高校524名大學(xué)生，采用疏離感和主觀幸福感量表進(jìn)行施測。