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...

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.


Repair Time
(hours) Months Since Type of
last service Repair Repairperson


2.9 2 electrical Dave Newton
3.0 6 mechanical Dave Newton
4.8 8 electrical Bob Jones
1.8 3 mechanical Dave Newton
2.9 2 electrical Dave Newton
4.9 7 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








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 = ?????? + ?????? Type




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).
Time = ???? + ????? Person