Why is there any non-random cause of variation


Assignment:

Problem:

A restaurant wishes to monitor their service quality Each day. 20 customers were asked if they enjoyed the diner. The number responding "no" was tracked for 10 days as follows:

Day          1   2   3   4  5   6   7   8   9   10
#of No's    3   0   2   6  2   3   0   2   1   4

A. Construct control limits (UCL and LCT) with n (alpha) risk of 2% for this service.

B. Based on the control limits obtained above, is there any non-random cause of variation? Why?

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Operation Management: Why is there any non-random cause of variation
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