Here are the data I collected over 35 years of running marathons. Use the data to come up with the best estimate, in your opinion, for a regression equation that could predict my time in a marathon by selecting the best variables. (Assumptions: age=81, weight=170, mileage=480, 20 milers=0, Course difficulty=1, temperature=60, after heart attack=Yes. Explain your result and your assumptions. (0.6 points)