In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error into the poll.

除了样本误差外，全国性的公众意见的调查操作上的困难也会导致误差。

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The antidotes for solving these problems in our country's public opinion survey report are the folio wings. Firstly, probability sampling should become main sampling method in public opinion survey.

解决当前我国民意调查报道中的主要问题的对策是：一是概率抽样应成为民意调查抽样的主要方式；

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If an opinion on the bulk is requested special arrangements in writing must be made in advance with the Company for the inspection and sampling of the bulk.

如果要求对抽样总体出具意见，则必须针对抽样总体的检验和抽样，提前与本公司制定有关的书面安排。

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The evaluation was based on a random sampling of American opinion toward car brands in seven areas: quality, safety, value, performance, design, technology and environmental friendliness.

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The bedrock on which the study is founded is the same as that on which opinion polls are built: random sampling.

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