Johnson Filtration, Inc. provides maintenance service for water-filtration systems. Data that follow show the repair time in hours, the months since last service, the repair type and the repair person...

Extracted text: Johnson Filtration, Inc. provides maintenance service for water-filtration systems. Data that follow show the repair time in hours, the months since last service, the repair type and the repair person for a sample of 10 maintenance service calls. Click on the datafile logo to reference the data. DATA file Repair Time Months Since in Hours Last Service Type of Repair Repairperson Dave Newton Dave Newton Bob Jones Dave Newton Dave Newton Bob Jones 2.9 2 Electrical 3.0 6. Mechanical 4.8 8. Electrical 1.8 3 Mechanical 2.9 Electrical 4.9 7 Electrical 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 the months since last service and the repairperson data. Let type of repair be a dummy variable with 0 indicating a mechanical repair and 1 indicating an electrical repair. Develop the estimated simple linear regression equation that can be used to predict the repair time based on the type of repair (to 3 decimals). Time = |Туре b. Is type of repair a good predictor of the repair time? Select v c. Ignore the months since last service and the type of repair data. Let repairperson be a dummy variable with 0 indicating Bob Jones and 1 indicating Dave Newton. Develop the estimated simple linear regression equation that can be used to predict the repair time based on the repairperson (to 2 decimals). If required enter negative values as negative numbers. Time = Person d. Compare your results from parts (a) and (c). What can you conclude? Select Who is the faster repairperson? Select