Suppose the two populations X and Y are independent of each other and obey the normal distribution. The mean and variance of X areμ1,σ12, the mean and variance of Y areμ2,σ22, that is X~N(μ1,σ12), Y~N (μ2,σ22),this page is the differenceσ12/σ22 hypothesis testing, the statistics are
，S12,S22For the sample variance of the two sets of samples,
their square root is called the sample standard deviation, n1, and n2 is the corresponding sample size.
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