The Geometric Mean works better than the median for reporting the best middle task time for sample sizes less than 25.
对于测试样本低于25以下时，几何平均值比中位数能更好的报告最佳任务完成时间中间值。
Objective: To estimate the confidence interval for paired sample median.
目的估计配对资料中位数可信区间。
Under population follow normal distribution hypothesis, designing combine median-range adaptive control charts with variable sampling interval, variable sample size and variable control limit .
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。
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