Very comprehensive list of statistics formulas.
Stat Trek
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An online statistics book with links to other statistics resources on the web.
HyperStat Online Statistics Textbook
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Site gives detailed explanation of what a confidence interval implies and how to construct one.
Stat Trek
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Description of the Confidence Interval with Normal distribution. Advanced
Wolfram MathWorld
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Includes the defintion and formulas for confidence intervals as well as some examples and visual references.
Yale University, Dept of Statistics Home Page
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