A Leisure World Cohort Study examined a random sample of people who are 90 and older. Each

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A Leisure World Cohort Study examined a random sample of people who are 90 and older. Each was categorized having dementia (1), or no sign of dementia (0). According to the U.S. Census there are 2,390,358 individuals who are in this age category. Determine a confidence interval estimate of the number of people 90 and over who have dementia.

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