tTest-OneSample-Var-Algorithm
Let be the variance of sample and is the hypothetical variance, this function tests the hypotheses:
vs
To compare the variance, we firstly compute the Chi-square value by:
where is the sample variance. For a given significance level, , we will reject the null hypothesis when:
, for two tailed test
, for upper tailed test
, for lower tailed test
And the confidence interval for the sample variance can be generated by: