Each selection provides a graphical interface for studying the power of one or more tests. They include sliders (convertible to number-entry fields) for varying parameters, and a simple provision for graphing one variable against another.
Sample Size and Confidence Interval Calculator, Significant Difference Calculator
Includes calculators for Power, Two Sample t-test, Correlation and Regression, Sample Size.
Compiled by John C. Pezzullo. Over 600 Links (including 380 Calculating Pages).