Acceptance Sampling
CHAPTER 10S
ACCEPTANCE SAMPLING
PROBLEMS
P1.
A 10ampere fuse is a weak link in an electrical circuit; if the fuse is defective. It could fail to
blow, even though the current exceeded 10 amps, thereby risking damage to equipment and
personal injury.
An electrical manufacturer uses enormous quantities of 10ampere fuses in its
products, which are purchased in lots of 100,000 from an outside supplier.
The contract provides
that each lot will be examined by the buyer according to this acceptance sampling plan: a random
sample of 20 fuses will be drawn from the lot and tested by being subjected to a current of 10
amperes; if 0 or 1 of them fail to blow, the lot will be accepted; if 2 or more of them fail to blow,
the lot will be returned.
a.
Which probability distribution should be used here?
Why?
b.
Calculate some points on the operating characteristic curve for this sampling plan.
c.
Draw the OC curve on a piece of graph paper.
Use the binomial probabilities supplied in
Table D of the appendix
in your textbook.
d.
The acceptable quality level (AQL) is a 5 percent defective fuse.
What type of sampling
error might be made at the AQL?
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 Spring '08
 WILLIAMCOSGROVE
 acceptance sampling, AQL, LTPD

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