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A poll was conducted in order to get an idea of the demand for vegetarian meals at restaurants. The study was commissioned by the Vegetarian Resource Group and was published in the Vegetarian Today. A random sample of 1100 U.S. adults was asked whether or not they sometimes order a vegetarian dish (one without meat, fish, or fowl) when dining out. Those who conducted the survey collected many characteristics of the participants, including political party affiliation. In this sample, 600 identified themselves as Democrats and 500 identified themselves as Republicans. Of those sampled, 252 Democrats and 200 Republicans said that they sometimes order a dish without meat, fish, or fowl when they eat out.
-Find a 95% confidence interval for the difference between the two population proportions of people that sometimes order a vegetarian meal when going out to eat. Let group 1 refer to Democrats and group 2 refer to Republicans.
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(0.42 - 0.40) ± 1.96...View Answer
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