Which of the following are the drawbacks of acceptance sampling? (i) Acceptance sampling is less expensive. (ii) Acceptance sampling has the risk of accepting good lots and rejecting bad lots. (iii) Acceptance sampling requires planning and documentation of the acceptance-sampling procedure whereas 100% inspection does not. (iv) Acceptance sampling requires less manpower.

Correct Answer: ii, iii
Acceptance sampling which is also known as lot-by-lot acceptance sampling has the disadvantage of accepting bad lots and rejecting good lots. Also, compared with other techniques it provides less information about the product or the process that manufactured the product. It also requires planning and documentation of the acceptance procedure which is not required in case of 100% inspection.