To combat red light-running crashes - the phenomenon of a motorist entering an intersection after the traffic signal turns red and causing a crash - many states are adopting photo-red enforcement programs. In these programs, red light cameras installed at dangerous intersections photograph the license plates of vehicles that run the red light. The Virginia Department of Transportation (VDOT) conducted a comprehensive study of its newly adopted photo-red enforcement program and published the results in a June 2007 report. In one portion of the study, the VDOT provided crash data both before and after installation of red light cameras at several intersections. The data (measured as the number of crashes caused by red light running per intersection per year) for 13 intersections in Fairfax County, Virginia, are given in the table. Intersection Before Camera After Camera Intersection Before Camera After Camera 1 3.60 1.36 8 0.73 0.24 2 0.27 0.0 9 3.15 1.57 3 0.29 0.0 10 3.21 0.43 4 4.55 1.79 11 0.88 0.28 5 2.60 2.04 12 1.35 1.09 6 2.29 3.14 13 7.35 4.92 7 2.40 2.72 Determine if the installation of red light cameras helped to reduce red light-running crashes. You will need to a) state appropriate null and alternate hypotheses, b) select the appropriate t-test and test your hypotheses using the p-value method, and c) state your conclusions.