To test the null hypothesis that the difference between two population proportions is equal to a nonzero

Question:

To test the null hypothesis that the difference between two population proportions is equal to a nonzero constant c, use the test statistic

As long as n1, and n2 are both large, the sampling distribution of the test statistic z will be approximately the standard normal distribution. Refer to the sample data included with the example presented in this section, and use a 0.05 significance level to test the claim of a medical expert that when women are exposed to glycol ethers, their percentage of miscarriages is 10 percentage points more than the percentage for women not exposed to glycol ethers.

Distribution
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