对于这些估计，给出它们的分布或近似分布，用经典方法可得到盲区半径的置信上限。
And for those point estimates, their distributions or approximate distributions are obtained. The confidence upper limits of the blind area radius Rm are obtained by using the classical approach.
运用区间估计方法代替传统的点估计方法，导出结构混凝土强度的置信上限、下限和置信区间。
Meanwhile, by using interval estimation instead of the conventional point estimation, the lower and upper confidence limits, the confidence intervals of structure concrete strength are derived.
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