The number of customers who are not satisfied with the service provided in a retail store is found for 20 samples of size 100 and is shown in Table 8-24. Construct a control chart for the proportion of dissatisfied customers. Revise the control limits, assuming special causes for points outside the control limits.

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TABLE 8-23 Sample 1 234567890123 11 Items Errors Sampled Sample Errors Items Sampled 12 400 14 18 400 9 400 15 8 400 13 400 16 6 400 7 400 17 4 300 6 400 18 6 300 10 400 19 5 300 14 400 20 8 300 7 400 21 10 16491 5 400 22 400 23 400 24 400 25 07453 300 300 300 300 300 400