StatTools : Sample Size for Estimating Population Standard Deviation : Tables

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Sample Size Introduction and Explanation Page
Sample Size for Population Parameters Explanation Page
Sample Size to Establish Population Standard Deviation Program Page

Sample Size Table for Standard Deviation Percent Error Table for Standard Deviation

The cells contain the sample size necessary to obtain the column Confidence Interval to within the row error of the true standard deviation. For example, 84 subjects will be necessary to obtain a 80% confidence that the standard deviation obtained is within ±10% of the true value.