Refer to Exercise 14.135. Do Americans spend more on health care as they age? To answer the question, economists turned to the Bureau of Labor Statistics to measure how much Americans in the following age groups spend annually on health care. (1) 55–64 (2) 65–74 (3) 75 and older Random samples of Americans 55 and older were taken and for respondent the age category and the amount spent on health care last year were recorded.

a. Is there enough evidence to infer that differences exist between the three age groups?

b. If differences exist which pairs differ? Use Bonferroni adjustment to answer the question.

In exercise 14.135

The U.S. Bureau of Labor Statistics conducts regular surveys to determine how Americans are spending their money. The annual expenditures for vehicle insurance of a random sample of American households in 2012, 2013, and 2014 were recorded. Is there sufficient evidence to infer that the expenditures differed in the three tear period?