11. A study was conducted on the effectiveness of an industrial safety program in reducing accidents resulting in lost time. The results, expressed in man-hours lost per month over a period of one year, were taken at six plants before and after the implementation of the safety program. Was the security program effective? Plants: 1, 2, 3, 4, 5, 6Before : 40, 66, 44, 72, 60, 32After: 33, 60,45, 67, 54, 31