# Question

As the U.S. population ages, the number of people needing medical care increases. Unless a cure is found in the next decade, one of the most expensive diseases requiring such care is Alzheimer’s, a form of dementia. To estimate the total number of Alzheimer’s cases in the future, a survey was undertaken. The survey determined the age bracket where 1 = 65–74, 2 = 75–84, 3 = 85 and over and whether the individual had Alzheimer’s (1 = no and 2 = yes). (Adapted from the Alzheimer’s Association, www.alz.org.)

Here are the projections for the number of Americans (thousands) in each of the three age categories.

a. Determine the 95% confidence interval estimates of the proportion of Alzheimer’s patients in each of the three age categories.

b. For each year listed, determine 95% confidence interval estimates of the total number of Americans with Alzheimer’sdisease.

Here are the projections for the number of Americans (thousands) in each of the three age categories.

a. Determine the 95% confidence interval estimates of the proportion of Alzheimer’s patients in each of the three age categories.

b. For each year listed, determine 95% confidence interval estimates of the total number of Americans with Alzheimer’sdisease.

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