Hypothesis testing of single normal total variance

It is known that the overall *X* obeys a normal distribution with a mean of μ, a standard deviation of σ,
and a variance of σ^{2}, ie *X*~* N*(μ,σ^{2}),
This page deals with the case where the mean value is unknown to the other party's difference hypothesis
test, and the test statistic is

。

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