A process which is in a state of statistical control (within ± 3s ) has an estimate of standard deviation (s) 2 mm
A process which is in a state of statistical control (within ± 3s ) has an estimate of standard deviation (s) 2 mm

Q. A process which is in a state of statistical control (within ± 3s ) has an estimate of standard deviation (s) 2 mm. The specification limits for the corresponding product are 120 ± 8 mm. When process mean shifts from 118 mm to 122 mm with no change in process standard deviation, the difference in process capability index Cpk is            

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