A person€™s heart attack risk can be estimated by using Framingham point scores, which are based on such factors as age, cholesterol level, blood pressure, and smoking habits. Men€™s risks of having a heart attack in the next 10 years are shown in Table 51 for various scores.

Let y be a man€™s risk (in percent) of having a heart attack in the next 10 years if his score is x points.
a. Find a regression equation.
b. Find the coefficient a of your model = abx. What does it mean in this situation?
c. A 47-year-old man with high cholesterol has high blood pressure but does not smoke. His score is 11 points. What is the risk he will have a heart attack in the next 10 years?
d. Another 47-year-old man has the same cholesterol level and blood pressure as the man described in part (c). However, this man€™s score is 5 points higher, because he smokes. What is the risk that he will have a heart attack in the next 10 years?

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Table 51 Risks of Having a Heart Attack Framinghanm Point Scores Risk (percent) 0 10 15 17 20 30