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.

Question

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This is true based on the formula for computing a confidence interval for a population standard deviation using the chi-square distribution. The degrees of freedom used is n-1 and the confidence level is determined by the alpha value and the critical values on the chi-square distribution curve.

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

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