8.11 The diabetes data set, provided by Michael Friendly at http://friendly.apps01.yorku.ca/

psy6140/examples/logistic/logidiab.sas, contains 145 observations on four measures of glucose or insulin levels, relative weight, and diabetic status (group). Use this data set to predict whether a patient is normal or diabetic from the other variables. Fully interpret the results of the analysis, including the process you used to select a final model and substantive interpretations of the parameter estimates.