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Discussion file #14 An 11-city study was done comparing traffic between intersections with red light cameras and intersections without red light cameras. Two intersections were selected for each city; one got a visible red light camera and the other got just monitoring equipment (not visible). Do the results below support, at an alpha = 0.047 level, that red light cameras reduce traffic fatalities at installed intersections? Hypothesis test results: H1 : mean of With Cam H2 : mean of W/O Cam M1 - 12 : mean difference Ho : HI - 12 = 0 HA : 141 - 12