Question: 2. Someone constructs an X chart where the control limits are at 2.5X rather than at 3X . a. If the process is in control,

2. Someone constructs an X chart where the control limits are at ±2.5σX rather than at ±3σX .

a. If the process is in control, what is the ARL for this chart?

b. If the process mean shifts by 1σX , what is the ARL for this chart?

c. In units of σX , how large an upward shift can be detected with an ARL of 10?

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