Heres a plot of the Studentized residuals from the regression model of Exercise 18 plotted against ArterialMPH.
Question:
a) The model in Exercise 18 includes indicators for city size. Considering this display, have these indicator variables accomplished what is needed for the regression model? Explain.
Here is another model that adds two new constructed variables to the model in Exercise 18. They are the product of Arterial MPH and Small and the product of Arterial MPH and VeryLarge.
b) What does the predictor AM*Sml (Arterial MPH by Small) do in this model? Interpret the coefficient.
c) Does this model improve on the model in Exercise 18? Explain.
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Related Book For
Business Statistics
ISBN: 9780321925831
3rd Edition
Authors: Norean Sharpe, Richard Veaux, Paul Velleman
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