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. Risk is interpreted as the probability (times 100) that a person will have a stroke over the next 10-year period. For the smoker variable, 1 indicates a smoker and 0 indicates a nonsmoker. An analysis from this study follows.

SUMMARY OUTPUT
Regression Statistics
Multiple R	0.9346
R Square	0.8735
Adjusted R Square	0.8498
Standard Error	5.7566
Observations	20
ANOVA
	df	SS	MS	F	Significance F
Regression	3	3660.7396	1220.2465	36.8230	0.0000
Residual	16	530.2104	33.1382
Total	19	4190.9500
	Coefficients	Standard Error	t Stat	P-value	Lower 95%	Upper 95%
Intercept	-91.7595	15.2228	-6.0278	0.0000	-124.0303	-59.4887
Age	1.0767	0.1660	6.4878	0.0000	0.7249	1.4286
Blood Pressure	0.2518	0.0452	5.5680	0.0000	0.1559	0.3477
Smoker	8.7399	3.0008	2.9125	0.0102	2.3784	15.1013

How much does the risk increase for each year of age advance?