This tool is used to test the null hypothesis that there is no difference between two population means against either one-sided or two-sided alternative hypotheses.
此工具用于检验两个总体平均值之间不存在差异的空值假设，而不是单方或双方的其他假设。
The second one is two-sided hypothesis test problem.
第二个是双边假设检验问题。
Sometimes the comparison between the drug effects of the two kinds is needed with the mean equivalent of two sided t-test; then the dose of a drug can be gradually extended.
用均值等效二次单侧检验方法，并对其逐步推广，从而对处理组与对照组进行检验，确定是否等效。
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