how to find margin of error how to calculate the confidence interval for a variance chran's theorem what is confidence interval used for what is the standard deviation of variance how to use cochran's theorem to calculate the confidence interval for a variance what is confidence test for variance what is the standard error of variance in cochran's theorem what is the standard error of a variance how do you tell if a variance is symmetrical what is the standard error of the variance what is standard error of variance why are confidence intervals never reported in variance why do people never report margins of error for variances how do you determine the confidence interval of a variance how do you get the standard error of a variance value what is the confidence interval of a variance what is the variance in the standard error curve how do you find a two-sided confidence interval of an estimate of variance? which arithmetic measure is not always true? how do i determine the confidence interval of a variance estimate