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) should 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 was selected 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 interval estimate for the mean highway mileage for SUVs.