# Question: As the U S population ages the number of people needing

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.

## Relevant Questions

The game of roulette consists of a wheel with 38 colored and numbered slots. The numbers are 1 to 36, 0 and 00. Half of the slots numbered 1 to 36 are red and the other half are black. The two “zeros” are green. The ...For each of the following, determine the number of degrees of freedom assuming equal population variances and unequal population variances.a. n1 = 15, n2 = 15, s21 = 25, s22 = 15b. n1 = 10, n2 = 16, s21 = 100, s22 = 15c. n1 ...The president of Tastee Inc., a baby-food producer, claims that her company’s product is superior to that of her leading competitor because babies gain weight faster with her product. (This is a good thing for babies.) To ...One factor in low productivity is the amount of time wasted by workers. Wasted time includes time spent cleaning up mistakes, waiting for more material and equipment, and performing any other activity not related to ...It is generally believed that salespeople who are paid on a commission basis outperform salespeople who are paid a fixed salary. Some management consultants argue, however, that in certain industries the fixed-salary ...Post your question