Solve the following problem:
Q: Is there more variation in the output of one shift in a manufacturing plant than in another shift? In an effort to study this question, plant managers gathered productivity reports from the 8 A.M. to 4 P.M. shift for eight days. The reports indicated that the following numbers of units were produced on each day for this shift.
5528 4779 5112 5380
4918 4763 5055 5106
Productivity information was also gathered from seven days for the 4 P.M. to midnight shift, resulting in the following data.
4325 4016 4872 4559
3982 4754 4116