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Sample size and CC

Six Sigma – iSixSigma Forums Old Forums General Sample size and CC

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    How do I reconcile sample size with control charting?  For example, if i decide to write up a data collection plan so as to determine the before and after effects of a CI effort using a 2 sample T, and use MTB for the resulting sample size calculation, do I then take this sample size calculation and make it divisible by CC sample size?
    For example, a required sample size for a 2 sample T (n=100) is then subgrouped into (n=4) for a total of 25 data points for the CC…and then continue with the analysis?  Thanks!

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