Q.4 [6 marks) A data set counts the length of hospital stay, in days of patients treated for coronary disease. Days are counted as discrete integer values. One of the predictor variables is procedure, which is either a percutaneous transluminal coronary angioplasty (PTCA) or a coronary artery bypass graft (CABG). We obtain following output using a software (Intercept) procedure Estimate 1.40475 0.94910 0.34265 Std. Error 0.01334 0.01215 0.01207 value 105.31 70.00 20.30