An early edition of Car and Driver magazine reported the engine horsepower, top speed (mph), curb weight

(pounds), and 0–60 mph acceleration time (seconds) for a selection of automobiles that ranged from large American

“muscle cars” to small economy imports. The data are in file XR17009. Using y 5 0–60 time and x 5 horsepower, fit a second-order polynomial model and predict the 0–60 time for a car with 300 horsepower. At the 0.05 level of significance, is the regression equation significant?