17. Does It Pay to Haggle? In Exercise 16, a survey done by Consumer Reports indicates that you should always try to negotiate for a better deal when shopping or paying for services.20 In fact, based on the survey, 37% of the people under age 34 were more likely to

“haggle,” while only 13% of those 65 and older. Suppose that this group included 72 people under the age of 34 and 55 people who are 65 or older.

a. What are the values of pˆ and pˆ 1 2 for the two groups in this survey?

b. Find a 95% confidence interval for the difference in the proportion of people who are more likely to “haggle”

in the “under 34” versus “65 and older” age groups.

c. What conclusions can you draw regarding the groups compared in part b?