单词stratified-random-sample
网络: 分层随机样本；分层随机抽样；分层随机土样
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。