Johnson Filtration, Inc. provides maintenance service for waterltration svstems. Suppose that in addition to information on the number of months since the machine was serviced and whether a mechanical or an electrical repair was necessary, the managers obtained a list showing which repairperson performed the service. The revised data follow. Click on the datale logo to reference the data. DATA Ifi l c Repair Time Months Since in Hours Last Service Tvpe of Repair Repairperson 2.9 2 Electrical Dave Newton 3.9 6 Mechanical Dave Newton 4.8 8 Electrical Bob Jones 1.8 3 Mechanical Dave Newton 2.9 2 Electrical Dave Newton 4.9 T Electrical Bob Jones 4.2 9 Mechanical Bob Jones 4.8 8 Mechanical Bob Jones 4.4 4 Electrical Bob Jones 4.5 6 Electrical Dave Newton a. Ignore for now the months since the last maintenance service {31 ]I and the repairperson who performed the service. Develop the estimated simple linear regression equation to predict the repair time (1:) given the tvpe of repair (32 ll. Recall that m; = i] if the type of repair is mechanical and 1 if the tvpe of repair is electrical [to 2 decimals}. Time = 0 + 0 Type I}. Does the equation that vou developed in part {a} provide a good t for the observed data? Explain. {to 4 decimals) 9, because the pvalue of 9 shows that the relationship is Q for anv reasonable value of o. c. Ignore for now the months since the last maintenance service and the tvpe of repair associated with the machine. Develop the estimated simple linear regression equation to predict the repair time given the repairperson who performed the service. Let #3 = 0 if Bob Jones performed the service and at; = 1 if Dave Newton performed the service {to 2 decimals}. Enter negative value as negative number. Time = 0 + 0 Person d. Does the equation that vou developed in part {c} provide a good t for the observed data? Explain. Repairpersnn is a betler predictor of repair time H'Ian the type of repair V @ Repair Time Months Since Type of (hours) Last Service Repair Repairperson 2.9 Electrical Dave Newton 3.0 Mechanical Dave Newton 4.8 Electrical Bob Jones 1.8 Mechanical Dave Newton 2.9 Electrical Dave Newton 4.9 Electrical Bob Jones 4.2 Mechanical Bob Jones 4.8 Mechanical Bob Jones 4.4 Electrical Bob Jones 4.5 Electrical Dave Newton