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Homework7_updated - y 53 11 12 Psychotherap y 63 12 13...

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Homework 7 Due next Thursday (3/29/2011) #1: Exercise 12.2 and Exercise 12.17 Examine the normal probability plot and the residual versus fit plot. How about adding one additional random variable, called x1*x2 and test the following model: ε β β β + + + = 2 1 12 2 2 0 x x x Y #2: Exercise 12.45 Examine the normal probability plot and the residual versus fit plot. #3: A study was performed to construct a prediction model for the degree of pain for patients with arthritis. The following data are obtained. Subject Pain Group Age 1 10 Control 55 2 12 Control 60 3 18 Control 75 4 13 Control 63 5 10 Placebo 66 6 9 Placebo 57 7 11 Placebo 61 8 10 Placebo 50 9 9 Psychotherap y 65 10 8 Psychotherap
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Unformatted text preview: y 53 11 12 Psychotherap y 63 12 13 Psychotherap y 66 In this study, 12 subjects were randomly assigned into three groups: control group where subjects were treated with medicine; placebo group where subjects were only treated with placebo; and the psychotherapy group where subjects were only treated with psychotherapy. Form a multivariate linear regression model to predict a person’s pain by using the group id and her/his age as predicting variable. Write down the mathematical model and clearly explain each component in your regression model....
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