分层随机样本

stratified random samples───分层随机抽样

stratified sample───分层抽样；[统计]分层样本

stratified samples───分层抽样

random sample───[数]随机样本；随意抽取调查；[天]随机样品

stratified charge engine───分层充气发动机

stratified charge engines───分层充气发动机

random samples───[数]随机样本；随意抽取调查；[天]随机样品

stratificational───分层

stratified-charge engine───分层充气发动机

Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.───方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。

Methods: Stratified random cluster sampling method was used to determine the survey sample.───方法：以分层随机整群抽样的方法，确定调查样本。

Define and apply techniques for assuring data accuracy and integrity such as random sampling, stratified sampling, sample homogeneity, etc.───定义和应用确保数据准确和完整的技巧，如随机抽样法、分层抽样法、样本同质性等。

There were 2052 participants and 808 of them having at least one child in school. It was a stratified random sample from Taiwan population.───研究调查20岁以上之台湾地区民众2052位，其中有在学子女者808位，样本为分层随机取样。

NORC has selected physician respondents from a stratified random sample of the American Medical Association's Physician Masterfile.───NORC在美国医学会医生数据库中随机分层选择应答对象。

Survey data were obtained from a stratified random sample of 517 Black and White students in a county school district in Maryland.───调查数据来自分层随机抽样的517个黑人和白人学生在县学区在马里兰州。