Even Before the Record Gas Prices During the Summer of 2008,an

Multiple Choice

Even before the record gas prices during the summer of 2008,an article written by Will Lester of the Associated Press reported on a poll in which 80% of those surveyed say that Americans who currently own a SUV (sport utility vehicle) should switch to a more fuel-efficient vehicle to ease America's dependency on foreign oil.This study was conducted by the Pew Research Center for the People & the Press.As a follow-up to this report,a consumer group conducted a study of SUV owners to estimate the mean mileage for their vehicles.A simple random sample of 91 SUV owners was selected,and the owners were asked to report their highway mileage.The following results were summarized from the sample data: = 18.2 mpg s = 6.3 mpg
Based on these sample data,compute and interpret a 90% confidence interval estimate for the mean highway mileage for SUVs.

A) (15.4,21.0)
B) (12.4,24.0)
C) (17.6,18.8)
D) (17.1,19.3)