12.11 Several companies are experimenting with the concept of paying production workers (generally paid by the hour) on a salary basis. It is believed that absenteeism and tardiness will increase under this plan, yet some companies feel that the working environment and overall productivity will improve. Fifty production workers under the salary plan are monitored at Company A, and fifty workers under the hourly plan are monitored at Company B.The number of work hours missed due to tardiness or absenteeism over a one-year period is recorded for each worker. The results are partially summarized in the following table:

a Fill in the missing information in the table.
b Is there evidence at the = 0.05 level of significance that the mean number of hours missed differs for employees of the two companies?

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Source df SS MS F-ratio Company Error 3,237.2 16,167.7 Total 99