从某个总体中抽取一个随机样本 ,样本中位数就是总体中位数的点估计值 ,但点估计值不能告知所估计的未知总体中位数的可信程度。而总体中位数的区间估计则可以告知对估计的未知总体中位数的可信程度 ,即总体中位数落入可信区间的概率的大小。估计可信区间时 ,一般取显著性水平 A random sample is taken from a population whose median is the point estimate of the overall median, but the point estimate does not tell the credibility of the estimated unknown population median. The overall median interval estimate can tell the credibility of the estimated unknown population median, that is, the probability that the overall median falls into the confidence interval. When estimating the confidence interval, generally take the significance level