Question: A control chart for nonconformities is maintained on a process producing desk calculators. The inspection unit is defined as two calculators. The average number of

A control chart for nonconformities is maintained on a process producing desk calculators. The inspection unit is defined as two calculators. The average number of nonconformities per machine when the process is in control is estimated to be two.
u = average # nonconformities/calculator =2
(a) Find the appropriate three-sigma control limits for this size inspection unit.
(b) What is the probability of type I error for this control chart?

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