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Listed below are the combined city – highway fuel consumption ratings (in miles per gallons) for...

Listed below are the combined city – highway fuel consumption ratings (in miles per gallons) for different cars measured in old rating system and cars in a new rating system introduced in 2008 (based on data from USA today).

A. Construct a 90 percent confidence interval of the difference in the ratings of cars.

Old Rating: 16 18 27 17 33 28 33 18 24 19 18 27 22 18 20 29 19 27 20 21

New Rating: 15 16 24 15 29 25 29 16 22 17 16 24 20 16 18 26 17 25 18 19

B. Based on the interval is there a reason to believe that there is a difference in the ratings of the two cars?

C. Is there any significant difference in the old and new ratings of cars? Use appropriate hypothesis test to answer this question.

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