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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In this situation, we once again reject the null if the p-value is less than alpha. One area (either to the right or the left) will be smaller.

To Compute a 95 Percent Confidence Interval for σ2, We

To Compute a 95 Percent Confidence Interval for σ², We