ABSTRACT
Ifthetolerancelimitsaresymmetrical(USL=-LSL=SLandUNL=-LNL=NL),thenfora normalpopulation,wecanobtainfromEqs.(4-7)and(4-9)theprocesscapabilityindexCPthatisequal tothefollowing:
SL(4-10)±- mo
where SL=one-halfofthespecifiedsymmetricaltoleranceinterval.
