After each thunderstorm, a technician is assigned to do a check on cellular towers in his or her service area. For each visit, the technician records in a database the tower number (Tower), the unit model (Model: A or B), and the extent of the damage to the unit (Damage: None, Minor, Partial, Severe, and Total for a total loss). A portion of the data is shown in the accompanying table.

a. Transform the Model variable into dummy variables. How many dummy variables should be created?

b. Transform the Damage variable into categorical scores ranging from 4 (Total) to 3 (Severe), 2 (Partial), 1 (Minor), and 0 (None). What is the average damage score of the cell towers?

Tower 1 2 E 98 Model A A B Damage Minor None Partial