本程序用R语言书写，主要用于研究对于不同的总体分布，采用何种假设检验方式比较好，纳入考虑的有t检验，符号检验，符号秩检验。结果主要澄清一个误区，不是所有情况下，t检验都有效。-This procedure using the R language written mainly used to study for different population distribution, hypothesis testing using what better way, have taken into account the t-test, sign test, signed-rank test. The main results clarify a misunderstanding, not under all circumstances, t test are valid.