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