To compute a 95 percent confidence interval for σ²,we use n − 1 degrees of freedom and the chi-square points on the distribution curve of χ²_α_/2 and of χ²₁₋₍_α_/2).

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To compute a 95% confidence interval for the variance (σ²), we use the chi-square distribution with n-1 degrees of freedom and the critical values χ²(α/2) and χ²(1-α/2) to determine the interval.

To Compute a 95 Percent Confidence Interval for σ2,we Use

To Compute a 95 Percent Confidence Interval for σ²,we Use