P value not greater than 0.05 for Capability Analysis

C

Cognizant

#1
As part of validation we did 3 PQ runs each run with 4 cavities. Total 36 data sets with 30 data points each.

We are ok on 34 data sets for which pvalue is greater than 0.05 and Cpks > 1.33.

We are struggling with the last two data sets for which p value < .05 but CPKS are way above 1.33. We did all the investigation and we could not figure out what is causing this issue. I am not sure how to satisfy our customer. Please respond.
 
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C

Cognizant

#3
for both data sets: p value<.005.
Anderson Darling Probability plot using Minitab
 
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reynald

Quite Involved in Discussions
#4
Well AD does have false alarms.
For instance I generated 36 datasets each with n = 30 using Normal (0,1) then used AD test on minitab.
3 were concluded as non-normal (p-valuees = 0.037, 0.035, 0.020 ).
So I guess if p-value is not very low, take the p-value conclusion in conjunction with the histogram and probability plots. Assess if it could pass visually.
 

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