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Six Sigma t Confidence Interval for a VarianceThe confidence interval (C.I.) includes the area under the curve in between the critical values, excluding the tail areas (the a risk). The entire curve represents the most likely distribution of population variances (sigma squared), given the sample's size and variation.  Six Sigma t Confidence Interval for a Variance ExampleCalculate a 95% C.I. on variance for a sample (n = 35) with an S of 2.3" This interval represents the most likely distribution of population variances, given the sample's size and variance. 95% of the time, the population's variance will fall in this interval
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