This page calculates the confidence interval for a binomial probability.
This page calculates estimates of sample size for a two-stage study, rejection and acceptance points for a two-stage trial, and power. User inputs hypothesized values as well as significance...
This page calculates either estimates of sample size or power for interaction tests. The program allows for unequal sample size allocation in the four cells defined by the two treatment groups and...
This site explains small sample hypothesis testing for a normal population and hypothesis testing for a population proportion. Includes examples and exercises.
This calculator returns the value of t for the difference between the means of two independent samples, for sample sizes up to n. Users are prompted for sample size as the page opens. It will also...
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