3. Define the confidence interval of a standard deviation

The formula for calculating a standard deviation estimate from a sample ${(x_{i})}_{i = 1 \dots n}$ from $n$ values is :

$s = \sqrt{\frac{\sum_{i = 1}^{n} {(x_{i} - \bar{x})}^{2}}{(n - 1)}} (1)$

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Define the confidence interval of a standard deviation

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