evaluate two alternative models for predicting the number of active physicians (Y) in a CDI.

Projects 6.28. Refer to the CDI data set in Appendix C.2. You have been asked to evaluate two alternative models for predicting the number of active physicians (Y) in a CDI. Plt Setl model I includes as predictor variables total population (X D, land area (X2), and total algast income (X3). Mama( model II includes as predictor variables population density (x I, total population divided by land area), percent of population aratram, 64 years old (X2), and total personal income (X3). a. Prepare a stem-and-leaf plot for each of the predictor variables. What noteworthy information is provided by your plots? b. Obtain the scatter plot matrix and the correlation matrix for each proposed model. Summarize the information crj. c. For each proposed model, fit the first-OlDer regression model (6.5) with three agt1 variables.
d. Calculate IV for each model. Is one model clearly preferable in tmof this measulC? e. For each model, obtain the residuals and plot them against Y, each of the arimpredictor SM, and each of the two-factor interaction terms. Also prepare a normal probability plot for each of the two fitted models. Interpret your plots and state your findings. Is one model clearly preferable in terms of appropriateness?

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