physical depiction -control charts

This topic has 1 reply, 2 voices, and was last updated 16 years, 11 months ago by MAK.

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July 11, 2005 at 6:34 pm #39967

Lomax
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When we say that control charts are based on 3 sigma limits, what actually we want to say in physical sense??
Why we normally, i would say always, take 3 sigma limits, knowing that it contains 2700ppm defectives.
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July 12, 2005 at 8:07 am #122912

MAK
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It means that if we assume a distribution of the data to be normal, then the probability of type 1 error is 0.0027, that is, an incorrect out-of-control signal or false alarm will be generated in only 27 out of 10000 points. Simple!!

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