u-test

Object Evaluation of the comparative methods of independent samples: Mest, u-test, Satterthwaite method, Cochran-cox method and Wilcoxon rank-sum test, offers some information for statistical analysis in practice.

目的对完全随机设计两样本比较常用方法t检验、u检验、Satterthwaite法，Cochran-cox法和Wilcoxon秩和检验等方法进行评价，为实际工作中统计方法的合理选择提供参考和依据。

When sample size is large enough, Mest, u-test, Satterthwaite method, Cochran-cox method and Wilcoxon rank-sum test are all recommended.

在两样本含量均较大时，t检验、u检验、Satterthwaite法，Cochran-cox法和Wilcoxon秩和检验等方法相互替代是可行的。

With standardized test scores in the U.S. dropping in recent years, some administrators believe students need to spend more time in the classroom instead of on the playground.

随着近年来美国标准化考试分数的降低，一些行政官员认为学生需要在课堂上花更多的时间，而不是在操场上。