 |
Variables
sampling plan
Determines n and k in inspection by variables
(ANSI/ASQC Z1.9-1980, ex-Mil-Std-414). |
|
|
| nmin, n,
nmax |
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Sample size: minimum, proposed, maximum. |
| AQL, α |
%
% |
AQL (acceptable quality level) and α (Type I error). |
| LTPD, β |
%
% |
LTPD (lot tolerance percent defective) and β (Type II
error). |
The example is for: code letter "I", for
which the OC curves are reproduced in this site.
Finds n and k
such that
t(t0; n, δ1) =
α and
t(t0; n, δ2) =
β (with t0 = k√n),
where
δ1 = Φ−1(1−AQL)
√n and
δ2 = Φ−1(1−LTPD)
√n. To
read the solution in the output, search for n and k such
that these two conditions are met. In the example shown, the answer is
n = 25, with
(k α β) =
(1.85 7.0 9.9) (9.9≅ 10%).
(To save space, "100.0%" has been replaced by "99.9%".)
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