When the process standard deviation ‚âà√¨‚àö√¢ is unknow – McqOptions

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1.	When the process standard deviation ‚âà√¨‚àö√¢ is unknown for a process, to calculate the PCR we use ____$
A.	The mean
B.	The variance
C.	The sample average
D.	The estimate of ‚âà√¨‚àö√¢
Answer» E.

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