A company samples 200 items per eight-hour shift and identifies the number of defective items produced. The results of the most recent 15 samples are to be used to develop a p chart to monitor the proportion defective for the process. The sampled data are as follows:

Develop a p chart and comment on whether it appears that the company€™s process is in control.

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Sample n- Sample Size Number of Defectives 200 200 200 200 200 200 200 200 200 200 200 200 200 200 96 120 108 144 96 108 144 108 132 120 84 132 96 96 72 10 12 13 14 15 200