Each day at a large hospital, hundreds of laboratory tests are performed. The rate of "non conformances," tests that were done improperly (and therefore need to be redone), has seemed to be steady, at about 4%. In an effort to get to the root cause of the non conformances, the director of the lab decided to study the results for a single day. The laboratory tests were subdivided by the shift of workers who performed the lab tests. The results are as follows:

a. Construct a side-by-side bar chart of non conformances and shift.
b. What conclusions concerning the pattern of nonconforming laboratory tests can the laboratory director reach?

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Shift Lab Tests Performed Day Evening Total Nonconforming 16 654 670 24 306 330 40 Toalorming60 3801,0%0 Total 1,000