A maker of personal computers, Noname, purchases 64K DRAM chips from two different manufacturers, A and B. Noname uses the following sampling plan: A sample of 10 percent of the chips is drawn and the lot is rejected if two or more defective chips are discovered. The two manufacturers supply the chips in lots of 100 and 1,000, respectively. a. For each manufacturer, determine the true proportion of defectives in the lot that would result in 90 percent of the lots being accepted. You may use the Poisson approximation for your calculations. b. Would you say that this plan is fair?

FINANCIAL ACCOUNTING
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ISBN:9781259964947
Author:Libby
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Chapter1: Financial Statements And Business Decisions
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Graph the OC curves for the sampling plan described in Problem 58 for both manufacturers A and B.

Problem 58

A maker of personal computers, Noname, purchases 64K DRAM chips from two different manufacturers, A and B. Noname uses the following sampling plan: A sample of 10 percent of the chips is drawn and the lot is rejected if two or more defective chips are discovered. The two manufacturers supply the chips in lots of 100 and 1,000, respectively.

a. For each manufacturer, determine the true proportion of defectives in the lot that would result in 90 percent of the lots being accepted. You may use the Poisson approximation for your calculations.

b. Would you say that this plan is fair?

 

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