A company has been producing bolts that are about p = 0.02 defective, and this is satisfactory. To monitor the quality of the process, 100 bolts are selected at random each hour and the number of defective bolts counted. With p = 0.02, compute the UCL and LCL of the p chart. Then suppose that, over the next 24 hours, the following numbers of defective bolts are observed: Would any action have been required during this time?
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