Based on this sample compute and interpret a 90% confidence inverval estimate for the mean highway mileage for SUVs.

A 2005 article written by Will Lester of the Associated Press reported on a poll in which 80% of those surveyed say that American who currently own a SUV (sport utility vehicle) shoudl switch to a more fuel-efficient vehicle to ease America’s dependency on foreign oil. 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 were slected and asked to report their highway mileage. The following results were reported:

Sample Mean = 18.2 mpg
Sample Standard Deviation = 6.3 mpg

Based on this sample compute and interpret a 90% confidence inverval estimate for the mean highway mileage for SUVs.

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