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Sampling for PPM

From: bill.newland@attws.com
Date: 05 May 1999
Time: 12:53:16

Comments

n = log(n) [1 - c] / log(n) [q]

where n = sample size c = confidence(%) q = quality level (ppm)

Can you tell me the derivation of this formula and if it is valid to use to determine a confidence level for a given quality level and sample size?


Last changed: November 20, 2007