Table B. 17 contains hospital patient satisfaction data. Fit an appropriate regression model to the satisfaction response using age and severity as the regressors and account for the medical versus surgical classification of each patient with an indicator variable. Has adding the indicator variable improved the model? Is that any evidence to support a claims that medical and surgical patients differ in their satisfaction?

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Satisfaction Age Severity Surgical-Medical Anxiety 68 55 50 0 2.1 7889122222222945828 77 46 24 1 2.8 96 30 46 1 80 35 43 59 61 74 38 42 27 42 51 50 53 38 41 30 37 31 24 34 42 30 50 48 58 61 60 71 62 62 68 38 0 70 41 26 79 66 63 31 1 83 39 42 0 75 49 40 1 899-73 3.3 4.5 2 5.1 5.5 3.2 3.1 2.4 2.2 2.1 1.9 3.1 4.2 4.6 5.3 7.2 7.8 6.2 4.1 3.5 2.1