http://demonstrations.wolfram.com/SampleSizeCalculationProportions/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration uses a normal approximation to the binomial distribution to estimate the minimum sample size, n, for detecting a change in the proportion of a population with a particular characteristic (the proportion defective, for example). The sa...
Contributed by: Joe O'Hara
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