Answer:
The best predictor of violent crime is the police officer wage.
Step-by-step explanation:
The police officer wage and correctional officer wage is related to the govenrment budget for security, which is calculated according to the society´s needs. In consequence, this two factors are strictly related with the amount of violent crime in the city, in particular, the police officer wage because this person works directly with the society.
The graduation rate, on the other hand may vary for other several reasons rather crime such as lack of capital, personal reasons, family, etc.