An online statistics book with links to other statistics resources on the web.
HyperStat Online Statistics Textbook
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Very comprehensive list of statistics formulas.
Stat Trek
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Site gives formulas and examples for testing a null hypothesis and analyzing the result.
Lake Tahoe Community College - Professor Green's Home Page
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Site gives visual references that explain when and why we use one-tailed tests.
University of Houston- ODonnell homepage
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