Problem 7-19 A recent 10-year study conducted by a research team at the Medical

Question

Problem 7-19

A recent 10-year study conducted by a research team at the Medical School was conducted to assess 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 (times 100) 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.

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Risk
Age Blood
Pressure
Smoker 12 57 150 No 26 60 165 No 11 59 155 No 57 86 170 Yes 28 59 196 Yes 50 76 189 Yes 17 56 155 Yes 32 78 120 No 37 80 135 No 15 78 98 No 22 71 152 No 36 70 173 Yes 15 67 135 Yes 48 77 209 Yes 14 60 199 No 36 82 119 Yes 8 65 166 No 34 82 125 No 3 61 117 No 39 60 208 Yes

Explanation / Answer

a) Risk=-91.7595+1.0767*Age+0.2518*BP+8.7399*smoker

b)p-value=0.0102 is less than alhpa=0.05, so it is significant

c)Risk=-91.7595+1.0767*68+0.2518*175+8.7399*1=34.26

probability=0.3426

weight, profession, income, married , number of children, social status etc...

analysis showed following information

Analysis of Variance Source DF Sum of
Squares Mean
Square F Value Pr > F Model 3 3660.73959 1220.24653 36.82 <.0001 Error 16 530.21041 33.13815 Corrected Total 19 4190.95000

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