Introduction to Statistical Quality Control
7th Edition
ISBN: 9781118146811
Author: Montgomery, Douglas C.
Publisher: John Wiley & Sons Inc
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Textbook Question
Chapter 4, Problem 52E
Analyze the residuals from the multiple regression model on the patient satisfaction data from Exercise 4.51. Comment on the adequacy of the regression model.
4.51. Reconsider the patient satisfaction data in Table 4E.11. Fit a multiple regression model using both patient age and severity as the regressors.
- (a) Test for significance of regression.
- (b) Test for the individual contribution of the two regressors. Are both regressor variables needed in the model?
- (c) Has adding severity to the model improved the quality of the model fit? Explain your answer.
TABLE 4E.11
Patient Satisfaction Data
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A magazine publishes restaurant ratings for various locations around the world. The magazine rates the restaurants for food, decor, service, and the cost per person. Develop a regression model to predict the cost per person, based on a variable that represents the sum of the three
ratings. The magazine has compiled the accompanying table of this summated ratings variable and the cost per person for 25 restaurants in a major city. Complete parts (a) through (e) below.
Click the icon to view the table of summated ratings and cost per person.
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b. Assuming a linear relationship, use the least-squares method to compute the regression coefficients b, and b,.
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c. Interpret the meaning of the Y-intercept, bo, and the slope, b,. Choose the correct answer below.
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Chapter 4 Solutions
Introduction to Statistical Quality Control
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