The following are the average weekly losses of work-hours due to accidents in 10 industrial plants before and after a certain safety program was put into operation: 45 and 36, 73 and 60, 46 and 44, 124 and 119, 33 and 35 57 and 51, 83 and 77, 34 and 29, 26 and 24, 17 and 11 Can we say with 95% confidence that the new safety program made a difference in the mean weekly loss of work-hours due to accidents? You can assume that the difference in the average weekly losses of work-hours roughly follows a normal distribution. Justify your answer.