Sample size for variable atribute data
June 27, 2006 at 2:41 am #43844
During “validation” runs I have had customers asked me to pull 60 pieces to collect variable data out of my production runs independent on the amount of pieces that one of this daily runs can produce. The claim being that 60 or more will give me a 95% confidence level that any process information infered from the data will be true. For atribute data I been asked to pull a minimum of 300 units out of my lots, independent of the lot size.
Can someone out there explain if this is true? Your help is appreciatted
0July 3, 2006 at 7:41 am #139888
Alexander S.O.Participant@Alexander-S.O. Include @Alexander-S.O. in your post and this person will
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AJ, I think you can obtain the 95% confidence in your data using a military standard to obtain your sample, for example using a MIL STD 105D you need to adjust your Acceptance Quality Level, define your inspection level and it works using your lot size.0July 3, 2006 at 8:13 am #139891
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