Question: In a random sample of 400 consumers in a given city, 250 preferred Brand A cars to Brand B cars. Find an 80 percent confidence

In a random sample of 400 consumers in a given city, 250 preferred Brand A cars to Brand B cars. Find an 80 percent confidence interval for the true proportion of consumers who prefer Brand A to Brand B. Use this to test the hypothesis Ho'.p = .50 against Hi'.p ^ .50 with a = .20.

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