Analysis variation among the lots during cpk calculation.

Kid006

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#1
We had a finding regarding a validation made by an engineer that is not longer working here, they were asking for a variation analysis of the CPK calculation between 3 manufactured lots.
An Anova, Boxplot or Interval plot can be enough to desmotrate the variation among the lots?
Is there an actual option in minitab to demostrate the variation among the CPK of the lots?

Thanks for any help
 
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