Here are data relating the carbon footprint (tons of CO2 per year) to the new Environ-mental Protection Agency (EPA) highway mileage for 82 family sedans as reported by the U.S. government (www.fueleconomy.gov/feg/byclass.htm). The car with the highest highway mpg and lowest carbon footprint is the Toyota Prius.

a) Would Spearman€™s rho be an appropriate summary of the strength of the association shown here?
b) Find rho for the full data and for the relationship with the Prius removed. Comment.

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9.0 7.5 3 6.0 3 88. 25 30 35 4045 Highway mpg