Question: Categorizing the output. Previously, control of the process was based on categorizing the thickness of each film inspected as satisfactory or not. Steady improvement in

Categorizing the output. Previously, control of the process was based on categorizing the thickness of each film inspected as satisfactory or not. Steady improvement in process quality has occurred, so that just 15 of the last 5000 films inspected were unsatisfactory.

(a) What type of control chart discussed in this chapter might be considered for this setting, and what would be the control limits for a sample of 100 films?

(b) Explain why the chart in part

(a) would have limited practical value at current quality levels.

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