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Each of these web sites is really a fairly complete online statistical software package in itself.

Here are some of these "comprehensive" statistical analysis web sites: Check out the Power And Sample web site, which contains (at last count) 19 interactive calculators for power or required sample size for many different types of statistical tests: testing 1 mean, comparing 2 or more means, testing 1 proportion, comparing 2 or more proportions, testing odds ratios, and two 1-sample tests (normal and binomial-based).

This site also provides calculators for non-inferiority and equivalence studies.

Also, look at the very general and elegant power/sample-size calculator by Russel Lenth (U of Iowa).

It handles tests of means (one or two samples), tests of proportions (one or two samples), linear regression, generic chi-square and Poisson tests, and an amazing variety of ANOVAs -- 1-, 2-, and 3-way; randomized complete-block; Latin and Greco-Latin squares; 1-stage, 2-stage, and factorial nested designs; crossover; split-plot; strip-plot; and more!

This calculator is implemented in Java, and can be run as a web page, or can be downloaded to your computer to run offline as a stand-alone application.

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