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An epidemiologist interviews 200 people over age forty and learns that 139 of the them had measles as a child. Use the normal distribution to find a 90% confidence interval for the proportion of people
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An epidemiologist interviews 200 people over age forty and learns that 139 of the them had measles as a child. Use the normal distribution to find a 90% confidence interval for the proportion of people over age forty who have had measles as a child.

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