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HW-Check Your Understanding: Fueleconomy.gov gives the city and highway fuel economy for all makes and models of vehicles back to 1984. The table gives the city and highway fuel economy (mpg) for a random sample of ten 2021 vehicles. City fuel economy 14.4 24.3 27.2 (mpg) 29.9 20.4 28.8 20.9 23.2 28.6 25.4 Highway fuel 25.5 37.4 36.5 45.5 economy (mpg) 28.7 46.1 33.6 38.3 41.3 35.3 a. Calculate the equation of the least-squares regression line. b. Make a residual plot for the linear model in Question 1. c. What does the residual plot indicate about the appropriateness of the linear model? Explain your