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Файл:(EOD).Quality control.pdf
page 33
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np for α |
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calculate until close |
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READING: chapter 8, pg. 283-320
PROBLEMS: pg. 321- #1, 4, 7, 14, 17, 22
4.5.1 Practice Problems
1. Show the effect of lot screening if the sample size is n=100 and the reject limit is c=1.
2.
a) Develop a double sampling plan OC curve given that,
N = 1000 n1 = 50 c1 = 2
r1 = 4
n2 = 100
c2 = 3
b)What is the AOQL?
3.a) Develop Operating Characteristic (OC) curves for the three cases below,
a)N = 1000, n = 20, c = 4
b)N = 1000, n = 40, c = 8
c)N = 1000, n = 80, c = 16
b) For each curve indicate the AQL and RQL for a producer risk of 5% and a consumer risk of 10%
(ans. for n=20,c=4, AQL=10%, RQL=40%, for n=40,c=8, AQL=11.8%,RQL=33%, for n=80,c=16, AQL=13.8%,RQL=N.A.)