Question: A paper mill has decided to use a c-chart to monitor the number of imperfections in large paper sheets. The data set in DS 16.4.4

A paper mill has decided to use a c-chart to monitor the number of imperfections in large paper sheets. The data set in DS 16.4.4 records the number of imperfections found in k = 22 sheets of paper sampled at different times.
(a) Construct a c-chart. Why does it appear that the process was out of control at certain times while this data set was collected?
(b) What c-chart would you recommend be used to monitor future samples of paper?
(c) How many imperfections would need to be discovered in a future randomly sampled paper sheet for the process to be considered to be out of control?

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