Large-scale integrated (LSI) circuit chips are made in one department of an elec

Question

Large-scale integrated (LSI) circuit chips are made in one department of an electronics firm. These chips are incorporated into analog devices that are then encased in epoxy. The yield is not particularly good for LSI manufacture, so the AQL specified by that department is 18% while the LTPD acceptable by the assembly department is 53%. Assume the company is willing to accept a consumer's risk of 10 percent and a producer's risk of 5 percent.

a) Find the sample size. (Round up your answer to the next whole number.)

Sample size = ____

b) How would you tell someone to do the test?

Randomly sample LSI using the sample size from part a, reject the lot if more than ________ defective.

Explanation / Answer

AQL = 0.18

LTPD = 0.53

LTPD / AQL = 0.53 / 0.18 = 2.94

From LTPD/AQL table, c= 7, n* (AQL) = 3.981

Thus n = 3.981 / 0.18 = 22.11 or 23 (rounded off)

b) Sample 23 LSI and reject a lof if more than 7 are defective.

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