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Question
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:
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)
Answer
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When developing a confidence interval estimate, the confidence level is calculated based on the size of the sample and the population standard deviation.