分层抽样

Methods : A questionnaire survey was conducted among 411 medical staff in 15 departments by stratified cluster sampling.

采用分层随机整群抽样方法，对我院15个部门中的411在职医务人员进行问卷调查。

Methods｜ 10 106 children under 5 years old were selected by cluster sampling.

方法按照分层整群抽样的方法，抽取5岁以下儿童共10 106人，进行营养知识问卷，测量身高、体重。

To interview1483 residents of 15 years and above by the way of stratified and cluster sampling.

通过分层整群抽样访谈调查了黑水县15岁以上居民1483人。

Methods The stratified cluster sampling was used to research 395 college students of Huangshan college by questionnaires.

采用分层整群抽样方法对安徽黄山学院395名大学生进行网络行为问卷调查。

Methods: The survey were designed by stratified cluster sampling.

方法采取分层整群抽样的方法。

Methods Questionnaire survey was conducted with stratified cluster sampling.

方法采用分层整群抽样的方法，进行无记名问卷调查。

Methods With stratified cluster sampling method,1?

采取分层随机抽样方法，对沈阳市2所大学1？

Methods To use the methods of delamination and systematic in 8212 persons in the urban districts of Xuzhou.

利用分层整群抽样和系统分析的方法。

Therefore, the minimum variance and deviation methodology was introduced, based on which, stratified random sampling technology was used for sample design, and thus making an overall assessment more truly on water quality in distributi.

为此提出以最小方差和偏差的方法论，采用分层随机抽样技术进行样本设计，从而对管网水质进行较为真实的全面评价，同时对影响管网水质的因素进行分析。

Methods A total of 6 352 students were chosen by multi stage randomized sampling, the information of the students aged 7-8 were collected by face to face interview, students aged 9-18 by self administered questionnaire. Results The incidence rate of injury was 48.0%, and there were 30.4% of the students reporting had committed injury. Every injury case had 1.58 injuries during one year averagely.

用4阶段分层随机整群抽样方法抽取大城市、中小城市、一类农村和二类农村各3个县区进行调查，每个县抽取1所学校，共对6 352名学生进行调查，小学一、二年级学生面对面访谈，三～六年级学生在调查员和老师的指导下完成，初、高中生自填。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。