A 10 -year study conducted by the American Heart Association provided data on how age, blood pressure, and smoking relate to the risk of strokes. Assume that the following data are from a portion of this study. Risk is interpreted as the probability (times100) that the patient will have a stroke over the next 10 -year period. For the smoking variable, define a dummy variable with 1 indicating a smoker and 0 indicating a nonsmoker. Risk Age Pressure Smoker
12 57 152 0
24 67 163 1
13 58 155 0
56 86 177 1

Requried:
a. Develop an estimated regression equation that relates risk of a stroke to the person's age, blood pressure, and whether the person is a smoker.
b. Is smoking a significant factor in the risk of a stroke? Explain. Use α= 0.05 .
c. What is the probability of a stroke over the next 10 years for Art Speen, a 68 -year-old smoker who has blood pressure of 175? What action might the physician recommend for this patient?