The chart below shows average fuel efficiency of new U.S. passenger cars.

a. Find the median-median line for the data.
b. What is the root mean square error for the median-median line model?
c. What is the real-world meaning of the root mean square error in 22b?
d. Is the median-median line a good model to use to predict fuel efficiency in the future?

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Average Fuel Efficiency 1970 1975 1980 1985 19901995 1998 1999 22.6 26.326.9 27.7 28.1 28.2 Year Fuel efficiency (mi/gal) 14. 15.1 (The New York Tmes Almanac 2002)