Risk of Stroke (%) Age Pressure Smoker (Yes=1) 12 57 152 0 24 67 163 0 13 58 155 0 56 86 177 1 28 59 196 0 51 76 189 0 18 56 155 1 31 78 120 0 37 80 135 1 15 78 98 0 22 71 152 0 36 70 173 1 15 67 135 1 48 77 209 0 15 60 199 0 36 82 119 1 8 66 166 0 34 80 125 1 3 62 117 0 37 59 207 1

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Risk of Stroke (%) Age Pressure Smoker (Yes=1)
12 57 152 0
24 67 163 0
13 58 155 0
56 86 177 1
28 59 196 0
51 76 189 0
18 56 155 1
31 78 120 0
37 80 135 1
15 78 98 0
22 71 152 0
36 70 173 1
15 67 135 1
48 77 209 0
15 60 199 0
36 82 119 1
8 66 166 0
34 80 125 1
3 62 117 0
37 59 207 1

1. If we choose the significance level α=0.01, is the variable Smoker a significant factor in explaining the risk of a stroke? Explain.  

2. What are the lower and upper bounds of the 99% confidence interval for the regression coefficient of the variable Smoker?  

3. Can you tell from the 99% confidence interval whether the variable Smoker a significant factor in explaining the risk of a stroke?  

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