A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the
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Question:
A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, she inspected units of output from each machine in random samples, with the following results:
Machine
Total Defectives
#
#
#
#
If upper and lower control limits were set as and which machines if any, appears to be outofcontrol for process proportion of defectives?
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