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 data below are from a portion of this study. Risk is interpreted as the probability (times 100) that patient will have a stroke over the next 10-year period.
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. Show me the regression equation.
b) Is smoking a significant factor in the risk of a stroke? Explain. Use alpha = 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 177? What action might the physician recommend for this patient?
Risk	Age	Pressure	Smoker
12	57	152	No
24	67	163	No
13	58	155	No
56	86	177	Yes
18	55	196	No
51	76	189	Yes
18	56	155	Yes
31	78	120	No
47	80	135	Yes
15	78	98	No
37	59	114	Yes
33	70	173	Yes
15	67	135	Yes
48	77	209	Yes
15	60	199	No
36	82	119	Yes
8	66	166	No
34	80	125	Yes
3	62	117	No
37	59	207	Yes