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Z-test of proportions: Tests the difference between two proportions. Confidence levels computed provide the probability that a difference at least as large as noted would have occurred by chance if the two population proportions were in fact equal. More information... To run a z-test, you will be prompted to provide the following: Proportions for the two independent groups Sample sizes for the two groups Both one- and two-tailed probabilities are computed using the data specified. As well as displaying actual probability levels, StarStat provides "broad" level of testing at 80%, 90%, 95% and 99% confidence levels, using 2-tailed tests.
StarStat - Test Significance of sample proportions (Z-Test) Math Guy
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