In designing control charts, companies usually use ______.

A. two standard deviations because narrower control limits may lead a manager to erroneously conclude that the process is out of control when in fact the variation that led to the points falling out of the control limits was purely random
B. two standard deviations because broader control limits may lead a manager to erroneously conclude that the process is out of control when in fact the variation that led to the points falling out of the control limits was purely random
C. three standard deviations because narrower control limits may lead a manager to erroneously conclude that the process is out of control when in fact the variation that led to the points falling out of the control limits was purely random
D. three standard deviations because broader control limits may lead a manager to erroneously conclude that the process is out of control when in fact the variation that led to the points falling out of the control limits was purely random


C. three standard deviations because narrower control limits may lead a manager to erroneously conclude that the process is out of control when in fact the variation that led to the points falling out of the control limits was purely random

Business

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