Please Help! what is ARL for the range and standard deviation

K

kikiENSA

hi friends hope you doing right by next Monday i will have an exam on SPC my question is



1. what is the ARL formula for the range and standard deviation (Xbar-R and Xbar-S) and the same question for the Beta RISK



2. what are the condition to use the probabilities control chart and are they better than Shewart cartes. THANK you all and hope you answer my question:):):):):):):):)
 
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