这说明在小样本下，研究参数的最短置信区间是必要的。

So it is necessary to research the shortest confidence interval of parameter for small samples.

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通过引入可靠度的置信区间和置信度的概念，可以把结构分析中的随机参数转化为置信区间下的区间数。

Using concepts of the confidence interval and degree of confidence, random parameters in an engineering structure can be transferred into the interval Numbers.

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导出在一定置信水平下控制置信区间宽度的样本量公式。

Sample size formulae that control the width of confidence interval with a certain confidence level are proposed.

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