In Problem 3.11, you used regression and dummy variables to see if two different antibiotic dosing schedules affected the relationship between efficacy and the effective levels of drug in the blood. A. Reanalyze these data, including in your analysis a complete regression diagnostic workup. B. If the linear model seems inappropriate, propose another model. C. If multicollinearity is a problem, do an evaluation of the severity of multicollinearity. If necessary to counter the effects of multicollinearity, reestimate the parameters, using an appropriate method.