Description: 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
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ttest.c
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