Exam 10: Extension: Acceptance Sampling

The quality manager for Frozen Pizzas, Inc., is concerned about the quality of the lot of several thousand pizzas which his company produced this week, and is now ready to ship. If he uses an acceptance sampling plan of n = 8 and c = 1, what will be the average outgoing quality for lots with 10 percent defectives?

Shipments of bowling balls are sampled before delivery to a warehouse. Lots of 600 balls are checked, using 10 observations from each lot. Any lot with more than one defective is rejected. Calculate values for the operating characteristic curve for this sampling plan.

The quality manager for Frozen Pizzas, Inc., is concerned about the quality of the lot of several thousand pizzas which his company produced this week, and is now ready to ship. If he uses an acceptance sampling plan of n = 8 and c = 1, what is the probability that, if this lot is 15 percent defective, it will be rejected and completely inspected prior to shipment?

The quality manager for Frozen Pizzas, Inc., is concerned about the quality of the lot of several thousand pizzas which his company produced this week, and is now ready to ship. If he uses an acceptance sampling plan of n = 8 and c = 1, what is the probability that, if this lot is 10 percent defective, it will be accepted for shipment without inspection?

The quality manager for Microelectronics, Inc., is concerned about the quality of the batch of several thousand Z-box games which his company is about to ship. If he uses an acceptance sampling plan of n = 20 and c = 1, what will be the average outgoing quality for batches with 15 percent defectives?

The ability of an acceptance sampling plan to discriminate between good and bad lots is described by its operating characteristic curve.

Which one of the following would not be a reason for using acceptance sampling?

Acceptance sampling is most useful when the cost consequences of passing defectives are low.

Suppose we have a lot of several thousand units of a finished good. If n = 20 and c = 2, what is the probability that, if this lot were 5 percent defective, it would be rejected and completely inspected prior to shipment? 10 percent defective? 15 percent? 20 percent?

The quality manager for Graphics, Inc., is concerned about the quality of the lot of several thousand posters which her company printed this week and is now preparing to ship. If the cost of replacing a defective poster once it has been shipped is $10.00, while the cost of complete 100 percent inspection prior to shipment is $.50 per poster, at what point is she indifferent between complete inspection and shipment without inspection?

A Type I (alpha) error occurs when:

Which of the following is associated with consumer's risk?

A graphical representation that shows the risk of: (1) accepting bad lots and (2) rejecting good lots is called the:

Sampling plans typically specify:

In a double-sampling plan, a second sample is taken if the results of the first sample are inconclusive.

Suppose a batch is of unacceptable quality. There is a 10 percent chance that it will be accepted. Thus, ________ is 10 percent.

In a double-sampling plan, a second sample may not be taken if the results of the first sample are conclusive.

Suppose that only two incoming fraction defective levels, 2 percent and 6 percent, are possible. The 2 percent incoming fraction defective level is twice as likely as the 6 percent. At a 2 percent incoming fraction defective, there's an 80 percent chance that a lot will be accepted. At 6 percent incoming fraction defective, there's a 20 percent chance that a lot will be accepted. Lots that are not accepted are subject to 100 percent sorting. What is average outgoing quality (approximately)?

The purpose of acceptance sampling is to:

The ability of a sampling plan to discriminate between lots of high quality and lots of low quality is described by: