Calculation of Standard deviation, Cp & Cpk in SPC

[rajesh_sutar2]

Foe below result achieved see calculation of how Mean Value, Standard deviation, Cp & Cpk is calculated in standard SAP

See below result of Mean Value, Standard deviation, Cp & Cpk is calculated in standard SAP

From above screen I have taken below reading

1. Calculation of Mean value

So Mean Value,    = (Sum of Recorded Result) / No. of Record

          Mean Value     = 38.667                       

                 

                     

The mean (38.667) is closer to one of them than to the other, leading to a Cpk factor (0.17) that is lower than the Cp value (0.22). This implies that the LSL is more difficult to achieve than the USL. Non-conformities exist at both ends of the histogram.