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State hypothesis determine the rejection region test

In a kids survey of 603 kids, 260 preferred Sonic. The next highest rating went to McDonalds by 79 kids. The advertising agency claims that Sonic is preferred by half of all children. Test this claim at the 0.05 significance level. State hypothesis, determine the rejection region, test statistic, state conclusion, and interpret the result.

b. Find a 95% confidence interval for the proportion of who preferred McDonalds

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