For a 3 sigma control chart of the process mean, the probability that the point falls outside control limits when the pr

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For a 3 sigma control chart of the process mean, the probability
that the point falls outside control limits when the process mean
has shifted from its target value when the sample size n=4, and the
magnitude of the shift delta = 0.15 standard deviations from the
mean is approximately 0.004 Select one: True False
_______________
It is recommended by quality control practitioners that process
mean be controlled prior to controlling process variation. Select
one:
True False