Test the null hypotheses that practice time does not make a difference in performance, practice set 1 is 10 numbers 58.7 55.3 61.8 49.5 64.5 61.0 65.7 51.4 53.6 and 59.0 Practice set 2 has 13 sets of numbers 54.6 51.5 54.7 61.4 56.9 64.4 55.8 58.7 54.7 52.7 67.8 61.6 and 58.7 third set is 13 sets of numbers 68.0 65.9 54.7 53.6 58.7 58.7 65.7 66.5 56.7 55.4 51.5 54.8 57.2

Second problem is Test the null hypotheses that there is no difference in the amount of stress between shifts. 4pm to midnight 10 numbers 7 7 6 9 8 7 6 7 8 and 9, next shift 12 midnight to 8 am 13 sets of numbers 5 6 3 5 4 6 5 4 5 5 6 7 and 6. Last shift 8 am to 4 pm 14 numbers 1 3 4 3 1 1 2 6 5 4 3 4 and 5