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 R Square Adjusted R Square Standard Error Observations ANOVA Regression Residual Total Intercept Age Blood Pressure Smoker 0.9346 0.8735 0.8498 5.7566 20 cif 3 16 19 Coefficien ts -91.7595 1.0767 0.2518 8.7399 55 3660.7396 530.2104 4190.9500 Standard Error 15.2228 0.1660 0.0452 3.0008 M5 1220.2465 33.1382 t Stat -6.0278 6.4878 5.5680 2.9125 F 36.8230 P-vaiue 0.0000 0.0000 0.0000 0.0102 Significance F D. U 00 0 Lower 95% -124.0303 0.7249 0.1559 2.3784 How much does the risk increase for each year of age advance? Upper 95% -59.4887 1.4286 0.3477 15.1013