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StarStat - Sample Precision Calculator
Sample Precision: Provides "sample precision" levels for desired sample sizes. It is helpful in determining answers to questions like... How large a sample do I need? How reliable is my research study overall? The only input required is a sample size. StarStat calculates a conservative "plus-or-minus" error level for proportions which may be observed in a research sample. More information... StarStat provides sample precision ranges at 80%, 90%, 95% and 99% confidence levels.
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