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Question $21$

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Which of the following is likely to happen when there is an increase in process variability?

Question $21$Select one:

a$.$

X$$ and R charts cannot be used to identify such variability in process

b$.$

X$$ chart reveals the increase, R$-$chart does not reveal the increase

c$.$

X$$ chart does not reveal the increase, R$-$chart reveals the increase

d$.$

X$$ and R charts both reveal the increase