查询词典 cluster sampling

Methods Randomized cluster sampling and a selfmade questionnaire were used in an onscene investigation.

采用随机抽样方法，运用自行设计的问卷调查表现场调查。

The common stressors are long working houres, short of working rest or even none of rest , bad labor environments , irrational labor institution and contradictory of social circumstances.1.2 The analysis of occupational stress900 Female workers were sampled at random with cluster sampling based on AET analysis.

1.2 职业紧张水平的研究以进入AET分析的各工种工人为基础人群。用整群抽样的方法，随机抽取各分析工种在岗一年以上900名女工作为紧张水平的研究对象。利用OSI-R中的OSQ和PRQ问卷测试作业女工的紧张水平和应变能力。

Methods Decorated houses within 6 months in Changchun were selected with the method of cluster radom sampling.

摘要摘要：目的探索室内装修空气污染的主要污染物、污染程度及对人群健康的影响。

Methods Decorated houses within 6 months in Changchun were selected with the method of cluster radom sampling.

目的 探讨室内装修空气污染的主要污染物、污染程度及对人群健康的影响。

Methods Decorated houses within 6 months in Changchun were selected with the method of cluster radom sampling.

采用随机整群抽样的方法，在长春市选择装修6个月内的住户，监测甲醛、氨和总挥发性有机物的

Methods Decorated houses within 6 months in Changchun were selected with the method of cluster radom sampling.To examine densities of formaldehyde,ammonia,total volatile organic compounds and complete questionaire.

采用随机整群抽样的方法，在长春市选择装修6个月内的住户，监测甲醛、氨和总挥发性有机物的浓度，同时进行问卷调查。

Methods Radom cluster sampling was used to choose 5 nursery schools,all 301 preschool children of low class were investigation object, and micronutrient measures such as serum zinc, iron, calcium and serum vitamin A were carried out.

随机整群抽取深圳市5家托幼机构，中、小班全体学龄前儿童3 0 1名为调查对象，进行血清锌、铁、钙、血清维生素A等微量营养素测量。

Through compared with the difference of the sampling inspection's OC curves between existent and nonexistent inspection error by utilizing grouping method, we get the conclusion that all the traditional methods are designed on the premise that there is none inspection error exist, so it would terribly depress the probability of acceptance and couldn't veritably reflect the quality of the lot for inspection, if the inspection error is exist when sampling inspecting.

同时通过对集团检验错误存在与否的抽样检验特征曲线的比较，指出：以往的集团抽样检验方案设计，都是在假设无检验误差前提下设计的，在抽样检验中，若存在检验错误，会严重影响抽样检验的接收概率，使抽样检验结果不能客观地反映检验批的质量。

Sampling error or allowable error is conventionally accepted between 1% and 10%; however, it is suggested that sampling error should be carefully assessed in light of the nature of the derivation of the population proportion and other aspects of the initial data.

抽样误差或允许误差是接受常规的1 ％和10 ％，但是，有人建议，抽样误差应当认真评估根据的性质推导的人口比例和其他方面的初步数据。

Meanwhile, the part of software has realized the function of the alternating electricity parameter analysis, the directing electricity parameter analysis and the demonstration, which is taking the sampled data in a sampling cycle as the examination object, and carrying on the analysis with the digital signal processing technology to the sampling data, and then programming with single chip.

软件部分则是以一周期内采集的数据为检测对象，用数字信号处理技术对采样的数据进行分析，用单片机进行编程，实现交流电参量和直流电参量分析及显示功能。

My father is over 60 years old, and he lifts weights every day.

我爸爸六十多岁了，他每天都练习举重。

Then in a serious tone she declared:"It doesn't pay, dear boy, to look like a ninny with one's wife the first night."

两眼湿润了，她把身子蜷得很小，这样似乎可以更好地闻闻自己。