15.11. Suppose that a supplier ships components in lots of size S. A singlesampling plan with n : 50 and c : 2 is being used for receiving inspection. Rejected lots are screened, and all defective items are reworked and returned to the lot. la] Draw the DC curve for this plan. {b} Find the level of lot qualityr that will be rejected 90% of the time. {c} Management has objected to the use of the above sampling procedure and wants to use a plan with an acceptance number c : fl, arguing that this is more consistent with their zerodefects program. What do you think of this? id} Design a singlesampling plan with c : D that will give a [1.90 probability of rejection of lots having the quality level found in part {b}. Note that the two plans are now matched at the LTPD point. Draw the 0C curve for this plan and compare it to the one for n : 5U. c = 2 in part {a}. le] Suppose that incoming lots are {1.5% nonconforming. What is the probabilitv of rejecting these lots under both plans? Calculate the ATI at this point for both plans. Which plan do you prefer? Whv