Deck 15: Acceptance Sampling– Static

Question 1

Sampling plans are designed considering both the cost and time required for the inspection.

Answer 1

True

Question 2

In a single-sampling plan, the entire lot, or batch of items, is accepted or rejected based upon only one specified sized sample.

Answer 2

True

Question 3

Flexible acceptance sampling revises the sampling plan in response to actual results.

Answer 3

False

Question 4

Acceptance sampling is a form of inspection applied to items during an ongoing process.

Question 5

Acceptance sampling procedures can be applied to both attribute and variables inspection.

Question 6

Acceptance sampling procedures are applicable for inspection both before and after production.

Question 7

When is the average outgoing quality level (AOQL) at its peak?

A) when the incoming fraction defective is at a minimum
B) when the incoming fraction defective is at a maximum
C) when the outgoing fraction defective is at a minimum
D) when the outgoing fraction defective is constant
E) when the outgoing fraction defective begins to increase

Question 8

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

Question 9

The purpose of acceptance sampling is to decide whether a batch of items satisfies pre-determined standards.

Question 10

Acceptance sampling is applied to batches of items during the production process.

Question 11

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

Question 12

A good sampling plan will occasionally reject a lot with very good quality.

Question 13

A double-sampling plan requires a second sample of exactly twice the size of the first sample.

Question 14

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

A) indifference curve.
B) operating characteristic curvE.
C) sampling plan.
D) inspection curve.
E) operating inspection plan.

Question 15

Suppose that only two incoming fraction defective levels, 4 percent and 8 percent, are possible. These incoming fraction defective levels are equally likely. At a 4 percent incoming fraction defective, there's a 60 percent chance that a lot will be accepted. At 8 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?

A) 40 percent
B) 20 percent
C) 10 percent
D) 4 percent
E) 2 percent

Question 16

Acceptance sampling plans must specify the lot size, the sample size, and the acceptance/rejection criteria.

Question 17

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

Question 18

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

A) LTPD
B) AQL
C) AOQL
D) SPC
E) Cpk

Question 19

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

A) LTPD
B) AQL
C) AOQL
D) SPC
E) Cpk

Question 20

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

Question 21

A lot can be "accepted" or "rejected" in a double-sampling plan:

A) after one sample is taken.
B) after two samples are taken.
C) only after two samples are taken.
D) All choices are correct.
E) Only after one and after two samples are taken is correct.

Question 22

A quality inspector for Alpha-Beta Co. is concerned about the quality of the batch of several thousand blank DVD disks which his company produced this week and is preparing to ship. If the cost of replacing a defective DVD disk once it has been shipped is $2.00, while the cost of 100 percent inspection prior to shipment is $.40 each, at what point is he indifferent between 100 percent inspection and shipment without inspection?

A) 0 percent defectives
B) 2 percent defectives
C) 5 percent defectives
D) 20 percent defectives
E) 30 percent defectives

Question 23

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

A) high cost of passing defectives
B) large number of items
C) destructive testing
D) boredom and fatigue that would accompany complete inspection
E) low cost of passing defectives

Question 24

An AOQ curve shows:

A) the maximum quality.
B) average outgoing quality relative to incoming quality.
C) how well a sampling plan can discriminate between good and bad lots.
D) the actual quality level.
E) "good" quality.

Question 25

A Type II (beta) error occurs when:

A) a bad lot is accepteD.
B) a good lot is rejected.
C) a bad lot is rejected.
D) a good lot is accepted.
E) a rejected lot is reinspected.

Question 26

The AQL indicates:

A) acceptable quality level.
B) average quality level.
C) actual quality level.
D) aggregate quality level.
E) approximate quality level.

Question 27

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) 5 percent
B) 10 percent
C) 12 percent
D) 20 percent
E) 25 percent

Question 28

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

A) a Gantt chart.
B) an operating characteristic curvE.
C) an average outgoing quality curve.
D) a process control chart.
E) a range chart.

Question 29

Sampling plans typically specify:

A) lot size.
B) sample size.
C) number of samples to be taken.
D) acceptance/rejection criteria.
E) all choices are correct.

Question 30

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)?

A) 1.60 percent
B) 1.47 percent
C) 1.20 percent
D) .73 percent
E) .80 percent

Question 31

A quality inspector for Alpha-Beta Co. is concerned about the quality of the batch of several thousand blank DVD disks which his company produced this week and is preparing to ship. If he uses an acceptance sampling plan of n = 5 and c = 2, what is the probability that, if this batch is 40 percent defective, it will be rejected and receive 100 percent inspection prior to shipment?

A) .1270
B) .2730
C) .3174
D) .6826
E) .7270

Question 32

A Type I (alpha) error occurs when:

A) a bad lot is accepted.
B) a good lot is rejecteD.
C) a bad lot is rejected.
D) a good lot is accepted.
E) an accepted lot is reinspected.

Question 33

The purpose of acceptance sampling is to:

A) estimate process quality.
B) estimate lot quality.
C) detect and eliminate defectives.
D) decide if a lot meets predetermined standards.
E) accept samples of products.

Question 34

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 she uses an acceptance sampling plan of n = 10 and c = 2, what is the probability that, if this lot is 10 percent defective, it will be accepted for shipment without inspection?

A) .9298
B) .0702
C) .8189
D) .2198
E) .5995

Question 35

An OC curve shows:

A) average outgoing quality.
B) the average outgoing quality limit.
C) out-of-control criteria.
D) operating control.
E) probability of acceptance versus lot quality.

Question 36

A quality inspector for Alpha-Beta Co. is concerned about the quality of the batch of several thousand blank DVD disks which his company produced this week and is preparing to ship. If, based on his acceptance sample, he decides to ship this batch without inspection, which type error would be possible?

A) inspector's error
B) producer's error
C) Type I error
D) Type II error
E) both Type I and Type II errors

Question 37

A quality inspector for Alpha-Beta Co. is concerned about the quality of the batch of several thousand blank DVD disks which his company produced this week and is preparing to ship. If he uses an acceptance sampling plan of n = 5 and c = 2, what will be the average outgoing quality for batches with 40 percent defectives?

A) .1270
B) .2730
C) .3174
D) .6826
E) .7270

Question 38

In acceptance sampling, the level of inspection automatically adjusts to the quality of lots being inspected, assuming that:

A) a single-sampling plan is used.
B) double-sampling plans are used.
C) multiple-sampling plans are used.
D) "rejected" lots are subjected to 100 percent inspection.
E) the incoming fraction defective remains constant.

Question 39

A lot can be "accepted" or "rejected" in a multiple-sampling plan:

A) after one sample is taken.
B) after two samples are taken.
C) after three or more samples are taken.
D) all of the choices.
E) none of the choices.

Question 40

Acceptance sampling plans might call for the selection of:

A) one or more samples.
B) a variable number of samples based on actual results.
C) random inspections.
D) outside audits by testing agencies.
E) 100 percent inspection.

Question 41

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 the cost of replacing a defective Z-box game once it has been shipped is $5.00, while the cost of complete (100 percent) inspection prior to shipment is $.20 each, at what point is he indifferent between complete inspection and shipment without inspection?

A) 0 percent defectives
B) 4 percent defectives
C) 5 percent defectives
D) 9 percent defectives
E) 22 percent defectives

Question 42

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?

A) .0263
B) .1237
C) .1756
D) .8244
E) .9737

Question 43

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 she uses an acceptance sampling plan of n = 10 and c = 2, what will be the average outgoing quality for lots with 20 percent defectives?

A) .13556
B) .20000
C) .23630
D) .58434
E) .32484

Question 44

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?

A) .0813
B) .0962
C) .1869
D) .7318
E) .8131

Question 45

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?

A) .8948
B) .8131
C) .6572
D) .5033
E) .3428

Question 46

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 is the probability that, if this batch is 15 percent defectives, it will be rejected and completely inspected prior to shipment?

A) .0263
B) .1237
C) .1756
D) .8244
E) .9737

Question 47

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?

A) .9619
B) .9428
C) .8131
D) .4305
E) .1869

Question 48

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 the cost of replacing a defective pizza once it has been shipped is $5.00, while the cost of complete (100 percent) inspection prior to shipment is $.30 per pizza, what is the point of indifference between complete inspection and shipment without inspection?

A) 1.67 percent defectives
B) 3 percent defectives
C) 5 percent defectives
D) 6 percent defectives
E) 16.7 percent defectives

Question 49

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, based on her acceptance sample, she decides to ship this lot without inspection, which type error would be possible?

A) Type I
B) Type II
C) both Type I and Type II errors
D) neither Type I nor Type II error
E) cannot be determined without further data

Question 50

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 indifference point between complete inspection and shipment without inspection is 12 percent defectives, and she decides to sample 15 posters (n = 15), what is the maximum number of sample defectives (c) for which this lot would be accepted for shipment without further inspection?

A) 0 defectives
B) 1 defective
C) 2 defectives
D) 3 defectives
E) 4 defectives

Question 51

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, based on his acceptance sample, he decides to ship this batch without inspection, which type error would be possible?

A) inspector's error
B) producer's error
C) Type I error
D) Type II error
E) both Type I and Type II errors