说明：  设 为来自总体 的容量为 的样本，在有了样本观测值 之后，很自然地想要知道它所代表的总体的“中心”在哪里？例如：今年保险索赔数额的中位数是否与去年一样，某行业工人工资跟前年相比是否有所提高等. 在考虑这一问题时，本节将介绍常用的检验方法:单样本符号检验.
( 翻译 英语 Set the overall capacity of the sample, in the wake of the sample observations, naturally wanted to know it represents the overall Center where is it? For example: this year, the median amount of insurance claims is the same as last year, some industries workers wage is higher than, and so on. In considering this question, this section explains commonly used test methods: one sample sign test.)