精选优质文档-倾情为你奉上试验设计与数据处理第三章:统计推断3-13 解:取假设H0:u1-u20和假设H1:u1-u20用sas分析结果如下: Sample Statistics Group N Mean Std. Dev. Std. Error - x 8 0. 0.0146 0.0051 y 10 0.2097 0.0097 0.0031 Hypothesis Test Null hypothesis: Mean 1 - Mean 2 = 0 Alternative: Mean 1 - Mean 2 = 0 If Vari