Johnson's management team wants to try to understand the relationship between repair time and the other variables using linear regression. They want to compare mechanical failures to the base case of electrical failures and they want to compare repair times of individual repair persons to that of (the base case of) Bob Jones. Remember that the base case for each factor does not have a variable associated with it. Also remember that dummy variables only take on the values of 0 or 1. Required:
Create the dummy variables for type of repair and for repair persons.