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 χ_α/2² and of χ_1-(α/2)².

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This is true. When computing a confidence interval for the population standard deviation, we use the chi-square distribution and (n-1) degrees of freedom. The critical values for the lower and upper bounds of the confidence interval are found using the chi-square points on the distribution curve of χ^2α/2 and χ^21-(α/2) with (n-1) degrees of freedom.

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

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