According to a great deal data of the sample survey, the author, using group-average, classify Karst scrub community in Guizhou Province into 13 type and elaborate main types.

根据大量实地调查样地资料，对贵州喀斯特灌丛群落进行组平均法的数量分类，将贵州喀斯特灌丛划分为13个类型，并对主要类型的生境条件、群落特征及分布等作了论述。

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This paper made empirical research on the relationship between the labor migration and urban unemployment in China according to the sample survey data of 1% population in 2005.

本文通过2005年1%人口抽样调查数据对我国劳动力流动与城市失业之间的关系进行了经验研究。

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Extracurricular activities reflect the differences in child rearing in the Pew survey, which was of a nationally representative sample of 1,807 parents.

皮尤研究中心对全国范围内具有代表性的1807名父母组成的样本进行了调查，发现课外活动反映了育儿方式的差异。

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But the report authors say the survey sample represents about 2.8% of the farming industry in Wales, a higher ratio than those that may be questioned in a political opinion poll, for example.

BBC: Study finds some Welsh farmers killing badgers

First, the change of 3% (from 45% to 48%) is not a very significant change unless the sample size of the survey, which is unclear, was sufficiently large.

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Among the most scientific and serious polls was the large-sample survey (844 respondents) by the Pew Research Center from Jan. 30 through Feb. 2.

CNN: By Ronald D. Elving, CQ Staff Writer