测试来自正态分布的随机抽样。
文中改进了测试性验证中的正态分布法，通过添加试验前计算，完全消除试验后计算，直接给出抽样方案。
In this paper, the normal distribution method is improved as it presents directly the sampling plan by adding calculation before test and completely removing after - test calculation.
在假设总体服从正态分布的条件下，设计了抽样区间，样本容量和控制限都变化的全变化参数的中位值-极差联合控制图。
Under population follow normal distribution hypothesis, designing combine median-range adaptive control charts with variable sampling interval, variable sample size and variable control limit .
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