6.4 Confidence Intervals for Variance and Standard Deviation. Key Concepts: Point Estimates for the Population Variance and Standard Deviation Chi-Square Distribution Building and Interpreting Confidence Intervals for the Population Variance and Standard Deviation.
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for each sample, it can be shown that follows a chi-square distribution with n – 1 degrees of freedom.
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We can start with:
and use algebra to get to:
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