3. A quality control inspector must estimate the proportion of defective microcomputer chips coming from two different assembly operations. She knows that, among the chips in the lot to be inspected, 60% are from assembly operation A and 40% are from assembly operation B. In a random sample of 100 chips, 38 turn out to be from operation A and 62 from operation B. Among the sampled chips from operation A, six are defective. Among the sampled chips from operation B, ten are defective. a. Consider only the simple random sampling design of selecting 100 chips, estimate the proportion of defectives in the lot and place a bound on the error of estimation. b. Stratifying the sample after selection, into chips from operation A and B, estimate the proportion of defectives in the population and place a bound on the error of estimation. Which answers do you find more acceptable?

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