Answer:
Hailey, the criminologist, is interested in studying how the mayor's new policies on police behavior are affecting police and resident interactions in a city where crime statistics have dropped significantly in the past four years. To answer this question, Hailey would need to conduct empirical research that focuses on examining the relationship between the mayor's policies, police behavior, and resident interactions. This research could be in the form of surveys, interviews, or observational studies of police activities and interactions with residents. The goal would be to measure and analyze the impacts of the policies across the various dimensions of citizen-police interactions in the city.