Question

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. Data from a portion of this study follow. Risk is interpreted as the probability (100 times ) 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.

Risk		Age	Blood Pressure		Smoker
20		83	196		1
36		65	132		1
14		66	112		0
63		56	142		0
26		69	137		0
47		79	143		1
7		66	111		1
26		77	212		0
33		74	150		1
23		87	143		0
38		82	141		0
36		71	145		0
22		55	103		0
59		63	218		0
36		64	198		1
35		66	217		1
37		65	118		0
37		77	118		0
16		88	200		1
39		78	107		0

a. Develop an estimated regression equation that can be used to predict the risk of stroke given the age and blood pressure level. Enter negative value as negative number. Use Table 4 in Appendix B.

The regression equation is (to 4 decimals)

s= (to 4 decimals) r^2= (to 4 decimals) adjusted r= (to 4 decimals)

Analysis of Variance

SOURCE DF SS (to 2 decimals) MS (to 2 decimals) (to 2 decimals) -value (to 4 decimals) Regression Residual Total

b. Consider adding two independent variables to the model developed in part (a), one for the interaction between age and blood pressure level and the other for whether the person is a smoker. Develop an estimated regression equation using these four independent variables. Enter negative value as negative number. Use Table 4 in Appendix B.

The regression equation is (to 4 decimals)

risk=

s= (to 4 decimals) r^2= (to 4 decimals) adjusted r= (to 4 decimals)

Analysis of Variance

SOURCE DF SS (to 2 decimals) MS (to 2 decimals) (to 2 decimals) -value (to 4 decimals) Regression Residual Total

Answer 1

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