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 = 0–60 time and x = 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?
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