Table 12-15 shows a sample of 30 observations on the choice of a vendor (A, B, or C) based on percent on-time delivery and unit cost of a product. Develop regression models to predict preference of a given vendor.

(a) If vendor C is selected to be the reference for comparison purposes, what is the model that compares preference of vendor B to that of vendor C? Interpret the model coefficients. Interpret the odds ratio for on-time delivery.

(b) Are the predictors significant if the chosen level of significance is 0.05?

(c) In comparing the preference of vendor A to that of vendor C, interpret the model coefficients.

(d) Are the models significant for a chosen level of significance of 0.05?

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TABLE 12-15 Data on Vendor Choice Percent Percent Vendor On-time Delivery Unit Cost Vendor On-time Delivery Unit Cost BCBAACBACBCAABC 80 15 72 12 79 16 90 15 88 17 74 14 82 17 86 26 70 10 83 19 76 12 93 18 89 16 79 73 14 74 17 AACBACBBACABBCA 90 25 87 28 70 10 80 15 88 30 71 12 82 15 84 19 88 27 73 12 201 92 28 75 18 80 17 75 14 94 26