Question: A normally distributed quality characteristic is monitored through the use of an x and an R chart using rational subgroups of size 4 . The

A normally distributed quality characteristic is monitored through the use of an x
and an R chart using rational subgroups of size 4. The parameters for the x chart are
CL =220.00, UCL =220.30 and LCL =219.70. The standard value L =3 was used for
both charts. Both charts exhibit control

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