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Sorry if this is posted in the wrong forum. I am trying to determine the sample size needed for Operational Qualification (OQ). I have ran some parts in the past, thus I can calculate my current mean, std, and CpK etc. How do I figure out what the sample size should be to pass a particular tolerance? For example, if one of OQ output is length (1" ± 0.5") and currently my mean is 1.05 with stdv 0.005, how would I calculate the sample size? Any help would be appreciated. I have Excel and Minitab 15 at my disposal.
Thanks
Thanks