Does the propensity for worker injuries depend on the length of time that a worker has been on the job? An analysis of 714 worker injuries by one manufacturer gave the results shown in the table for the distribution of injuries over the eight 1-hour time periods per shift.

a. Do the data imply that the probabilities of worker accidents are higher in some time periods than in others? Test using α = .10.

b. Do the data provide sufficient evidence to indicate that the probability of an accident during the last 4 hours of a shift is greater than during the first 4 hours? Test using α = .10.

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ACCIDENTS 1 2 Number of Accidents 93 71 79 72 98 89 102 110 Hour of Shift 4 5 6 7 8