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4. In a poll of 1500 people, 250 expressed support for a certain political party. (a) Find a 95% confidence interval for the true proportion

4. In a poll of 1500 people, 250 expressed support for a certain political party. (a) Find a 95% confidence interval for the true proportion of support- ers in the population. (b) In an earlier poll of 1200 people, 150 expressed support for the party. Find a 95% confidence interval to decide whether the change between the polls indicates a real change of support in the population

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