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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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