Dear all,
I was doing my annual product review to review the specification either it meets our internal specification or not. I calculated lower control limit and upper control limit given the formulation as (average - 2 x STD deviation) LCL and (average + 2 x STD Deviation ) UCL. I have never found that the LCL and UCL is over the specification limit. But this year i'm having difficulty as my UCL is over my specification limit. May I know what should i do next?
Thanks.