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2
O N L I N E T U T O R I A L
Acceptance Sampling
DISCUSSION QUESTIONS
1. Single sampling specifies the acceptable number of defects.
Double sampling means that a second sample is taken if the results
2. AQL (acceptable quality level) is the poorest level of quality
END-OF-TUTORIAL PROBLEMS
T2.1
Selected Values
Mean
of Fraction Defective
of Poisson
P(x 2)
0.01
0.8
0.953
0.02
1.6
0.783
0.03
2.4
0.570
0.04
3.2
0.380
0.05
4.0
0.238
0.06
4.8
0.143
0.07
5.6
0.082
0.08
6.4
0.046
0.09
7.2
0.025
0.10
8.0
0.014
0.01
0.05
0.999
0.05
0.25
0.974
0.10
0.50
0.910
0.15
0.75
0.827
0.20
1.00
0.736
0.30
1.50
0.558
0.40
2.00
0.406
0.60
3.00
0.199
0.80
4.00
0.092
1.00
5.00
0.040
ONLINE TUTORIAL 2 ACC EPTA NCE SA M P L I N G 365
T2.3
()
AOQ da
P P N n
N
−
=
Selected Values
of Fraction
Defective
P(x 1)
(N – n)/N
AOQ
0.01
0.999
0.975
0.0097
0.05
0.974
0.975
0.0475
0.10
0.910
0.975
0.0887
0.15
0.827
0.975
0.1209
0.20
0.736
0.975
0.1441
0.30
0.558
0.975
0.1632
0.40
0.406
0.975
0.1583
0.60
0.199
0.975
0.1164
0.80
0.092
0.975
0.0718
1.00
0.040
0.975
0.0390
No—the plan meets neither the producer’s nor consumer’s
requirement.
− −
==
=
( ) 0.02 0.67 (1,000 100)
AOQ 1,000
0.012
da
P P N n
N
T2.5
T2.4
Selected Values
Mean
of Fraction Defective
of Poisson
P(x 2)
0.01
1.0
0.920
1 –
at AQL
0.02
2.0
0.677
0.03
3.0
0.423
0.04
4.0
0.238
0.05
5.0
0.125
at LTPD
0.06
6.0
0.062
0.07
7.0
0.030
0.08
8.0
0.014
0.09
9.0
0.006
0.10
10.0
0.003
