Problem

Consider the following data for two variables, $x…

Problem 38 Easy Difficulty

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. Assume that the follow-
ing 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.
$\begin{array}{l}{\text { a. Develop an estimated regression equation that relates risk of a stroke to the person's }} \\ {\text { age, blood pressure, and whether the person is a smoker. }}\end{array}$
$\begin{array}{l}{\text { b. Is smoking a significant factor in the risk of a stroke? Explain. Use } \alpha=.05 \text { . }} \\ {\text { c. What is the probability of a stroke over the next } 10 \text { years for Art Speen, a } 68 \text { -year-old }} \\ {\text { smoker who has blood pressure of } 175 ? \text { What action might the physician recommend }} \\ {\text { for this patient? }}\end{array}$

Answer

a) $\hat{y}=-91.8+8.74 x_{1}+1.08 x_{2}+0.252 x_{3}$
b) 2.91
c) 34.48

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Chapter 13

Multiple Regression

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Desi U.

January 31, 2021

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. Assume that the follow- ing data are from a portion of this study. Risk is interpreted as the probability (ti

Desi U.

January 31, 2021

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Video Transcript

we have the total number. Oh, persons is equal to one. 30. Now we need to find the operability off. A person have elevated blood pressure so the number of persons having elevated blood pressure is equal to is 27. So the probe lt off a person having elevated blood pressure is equal to a number of persons having elevated blood pressure which is equal to 27 upon total number of person. Rhetorical too 1 30 So this is about

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