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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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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In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls.

除了取样错误之外，问题之文字表述、实际执行之困难亦会造成错误或偏诱，以致结果失真。

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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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