Business case estimation accuracy is usually very low, with the actual confidence interval often higher then 50%, as no detailed functional and project analysis is usually performed.
业务案例评估的精度经常很低，由于通常不能完成细节的功能分析，可信区间通常高达50%。
Results: Deduce the formula of the interval estimation of small sample and large sample.
结果：分别就小样本、大样本推导出区间估计公式。
The problem of interval estimation of earthquake prediction is discussed, based on the theory and method of interval estimation of extremum distribution.
在提出极值分布区间估计理论和方法的基础上，讨论了地震预报中的区间估计问题。
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