A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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This site is designed to provide information, demonstrations, links and quizzes associated with the statistics and statistical methods for research design and analysis. It includes tuorials and applets
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WebStat
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Very comprehensive list of statistics formulas.
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Stat Trek
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An online statistics book with links to other statistics resources on the web.
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HyperStat Online Statistics Textbook
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Gives an overview of significance testing and evaluating the results. Also, discusses the relationship between confidence intervals and significance testing.
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Lawrence University
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The website indexes lectures in Introduction to Statistical Methods course.
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Lecture Summaries: Introduction to Statistical Methods
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Site gives formulas and examples for testing a null hypothesis and analyzing the result.
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Lake Tahoe Community College - Professor Green's Home Page
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Site contains several explanations and examples for lots of statistics topics like graphs, hypothesis testing, types of distributions, etc.
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MathsRevision.net
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Site gives visual references that explain when and why we use one-tailed tests.
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University of Houston- ODonnell homepage
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