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Z test for equality of proportions.

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A nationwide sample of influential Republicans and Democrats was asked as a part of a comprehensive survey whether they favored lowering environmental standards so that high-sulfer coal could be burned in coal-fired power plants. The results were:

Republicans Democrats
Number Samples 1,000 800
Number in Favor 200 168

At the .02 level of significance, can we conclude that there is a larger proportion of Democrats in favor of lowering standards?

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The solution gives step by step procedure for the calculation of Z test for proportions. Null hypothesis, alternative hypothesis, Z value and test statistic are given with interpretations.

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A nationwide sample of influential Republicans and Democrats was asked as a part of a comprehensive survey whether they favored lowering environmental standards so that high-sulfer coal could be burned in coal-fired power plants. The results were:

Republicans Democrats
Number Samples 1,000 800
Number ...

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