T检验，亦称student t检验（Student s t test），主要用于样本含量较小（例如n<30），总体标准差σ未知的正态分布资料。



　　T检验是用于小样本（样本容量小于30）的两个平均值差异程度的检验方法。它是用T分布理论来推断差异发生的概率，从而判定两个平均数的差异是否显著

-T test, also known as the student t test (Student' s t test), mainly used for small sample size (eg n < 30), the overall standard deviation σ of the distribution of information unknown. T test for small samples (sample size less than 30) the average difference between the two levels of testing methods. It is a theory T can be inferred from differences in the distribution of the probability of occurrence in order to determine whether differences in the average two significant