Question: Assuming AQL 5 percent and LTPD 10 percent, determine the values of and for the plan described in Problem 58 for manufacturers A and B, and for the plan described in Problem 60 for manufacturers A and B.
Problem 60: Consider the sampling plan discussed in Problem 58. Would a fairer plan be to reject the lot if more than 10 percent of the chips in a sample are defective? Which of the two manufacturers mentioned would be at an advantage if this plan were adopted?
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?