Each day at a large hospital, several hundred laboratory tests are performed. the rate at which these tests are done improperly seems steady at about 4%. in an effort to get to the root cause of these nonconformances tests that need to be redone the director of the lab decided to keep records over a period of one week. the labortory tests were subdivided by the shift of workers who performed the lab tests the results were as follows
lab tests performed day evening total
nonconforming 16 24 40
conforming 654 306 960
total 670 330 1,000
construct side by side bar chart for nonconformances and shift
what conclusions concerning the pattern of nonconforming laboratory tests can the laboratory director reach