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There are several related psychology guides. They are:
Electronic Statistics Textbook
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General Textbooks on Statistics
Links to and descriptions of several online statistical textbooks.
Online textbook on statistics with a lot of interactive and visual features.
"A quick and easy way to chose the appropriate statistical test or measure for your data. The program leads you through a series of questions about your research and data and then suggests the test you should use and a statistical program that could be used to accomplish the analysis." [description from Intute]