Problem
Read "General Deterrent Effects of Police Patrol in Crime 'Hot Spots': A Randomized, Controlled Trial" in Voices from the Field (P. 66)
Evaluate the research design in terms of:
a) possible threats to validity (internal, external, statistical conclusion)
b) the reliability and validity of the measures (independent and dependent variables)
c) the appropriateness of the sample used for the study
d) possible ethical considerations.