Question 1

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

Accepted Answer

A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined. 
A) AOQ is greater than the true percent defective. 
B) AOQ is the same as the true percent defective. 
C) AOQ is less than the true percent defective. 
D) There is no relationship between AOQ and the true percent defective. 
E) The relationship between these two cannot be determined.

Question 2

Natural variations

Accepted Answer

A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control. 
A) are variations that are to be identified and investigated. 
B) are variations that can be traced to a specific cause. 
C) are the same as assignable variations. 
D) lead to occasional false findings that processes are out of control. 
E) play no role in statistical process control.

Question 3

Assignable causes

Accepted Answer

A) are not as important as natural causes. 
B) are within the limits of a control chart. 
C) depend on the inspector assigned to the job. 
D) are also referred to as "chance" causes. 
E) are causes of variation that can be identified and investigated. 
A) are not as important as natural causes. 
B) are within the limits of a control chart. 
C) depend on the inspector assigned to the job. 
D) are also referred to as "chance" causes. 
E) are causes of variation that can be identified and investigated.

Question 4

Which of the following statements on acceptance sampling is true?

Accepted Answer

A) Acceptance sampling draws samples from a population of items,tests the sample,and accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false. 
A) Acceptance sampling draws samples from a population of items,tests the sample,and accepts the entire population if the sample is good enough,and rejects it if the sample is poor enough. 
B) The sampling plan contains information about the sample size to be drawn and the critical acceptance or rejection numbers for that sample size. 
C) The steeper an operating characteristic curve,the better its ability to discriminate between good and bad lots. 
D) All of the above are true. 
E) All of the above are false.

Question 5

Why are x-bar and R-charts usually used hand in hand?

Accepted Answer

The ultimate goal of the x-bar and R-cha

Question 6

The ________ is the chief way to control attributes.

Accepted Answer

The answer of The ________ is the chief way to...

Question 7

The specifications for a manifold gasket that installs between two engine parts calls for a thickness of 2.500 mm ± .020 mm.The standard deviation of the process is estimated to be 0.004 mm.What are the upper and lower specification limits for this product? The process is currently operating at a mean thickness of 2.50 mm.(a)What is the   for this process? (b)The purchaser of these parts requires a capability index of 1.50.Is this process capable? Is this process good enough for the supplier? (c)If the process mean were to drift from its setting of 2.500 mm to a new mean of 2.497,would the process still be good enough for the supplier's needs?

Accepted Answer

(a)LSL = 2.48 mm. ,USL = 2.52 mm. @#IMG-DLM& = (2.

Question 8

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

Accepted Answer

OC or oper

Question 9

A Cpk index of 1.00 equates to a defect rate of

Accepted Answer

A) 5%. 
B) 3.4 defects per million. 
C) 2.7 per 1,000 items. 
D) 97.23%. 
E) 1%. 
A) 5%. 
B) 3.4 defects per million. 
C) 2.7 per 1,000 items. 
D) 97.23%. 
E) 1%.

Question 10

The specification for a plastic handle calls for a length of 6.0 inches ± .2 inches.The standard deviation of the process is estimated to be 0.05 inches.What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of 6.1 inches.What is the   and   for this process? Is this process capable of producing the desired part?

Accepted Answer

LSL = 5.8 inches,USL = 6.2 inches. @#IMG-DLM& is (

Question 11

The probability of rejecting a good lot is known as consumer's risk.

Accepted Answer

A) True 
 B)False

Question 12

What is the AOQ of an acceptance sampling plan?

Accepted Answer

The AOQ is the average outgoin

Question 13

Acceptance sampling's primary purpose is to

Accepted Answer

A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced. 
A) estimate process quality. 
B) identify processes that are out of control. 
C) detect and eliminate defectives. 
D) decide if a lot meets predetermined standards. 
E) determine whether defective items found in sampling should be replaced.

Question 14

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by

Accepted Answer

A) a Gantt chart. 
B) the Central Limit Theorem. 
C) a process control chart. 
D) an operating characteristics curve. 
E) a range chart. 
A) a Gantt chart. 
B) the Central Limit Theorem. 
C) a process control chart. 
D) an operating characteristics curve. 
E) a range chart.

Question 15

Ten samples of size four were taken from a process,and their weights measured.The sample averages and sample ranges are in the following table.Construct and plot an x-bar and R-chart using this data.Is the process in control?

Accepted Answer

@#IMG-DLM& @#IMG-DLM& The x-bar chart is out of co

Question 16

A Cp of 1.33 indicates how many sigma limits?

Accepted Answer

A) 1 
B) 1.33 
C) 2 
D) 3 
E) 4 
A) 1 
B) 1.33 
C) 2 
D) 3 
E) 4

Question 17

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for

Accepted Answer

A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation. 
A) Type I errors. 
B) about 95.5% variation. 
C) natural variation. 
D) all types of variation. 
E) assignable variation.

Question 18

Acceptance sampling is usually used to control

Accepted Answer

A) the number of units output from one stage of a process which are then sent to the next stage. 
B) the number of units delivered to the customer. 
C) the quality of work-in-process inventory. 
D) incoming lots of purchased products. 
E) the number of outgoing units. 
A) the number of units output from one stage of a process which are then sent to the next stage. 
B) the number of units delivered to the customer. 
C) the quality of work-in-process inventory. 
D) incoming lots of purchased products. 
E) the number of outgoing units.

Question 19

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Accepted Answer

A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) α and β determine the AQL. 
A) n and c determine the AQL. 
B) AQL,LTPD,α and β collectively determine n and c. 
C) n and c are determined from the values of AQL and LTPD. 
D) α and β are determined from the values of AQL and LTPD. 
E) α and β determine the AQL.

Question 20

Averages of small samples,not individual measurements,are generally used in statistical process control.

Accepted Answer

A) True 
 B)False

Exam 18: Statistical Process Control

Which of the following is true regarding the relationship between AOQ and the true population percent defective?

Natural variations

Assignable causes

Which of the following statements on acceptance sampling is true?

Why are x-bar and R-charts usually used hand in hand?

The ________ is the chief way to control attributes.

A(n)________ is a graph that describes how well an acceptance plan discriminates between good and bad lots.

A Cpk index of 1.00 equates to a defect rate of

The probability of rejecting a good lot is known as consumer's risk.

What is the AOQ of an acceptance sampling plan?

Acceptance sampling's primary purpose is to

An acceptance sampling plan's ability to discriminate between low quality lots and high quality lots is described by

Ten samples of size four were taken from a process,and their weights measured.The sample averages and sample ranges are in the following table.Construct and plot an x-bar and R-chart using this data.Is the process in control?

A Cp of 1.33 indicates how many sigma limits?

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for

Acceptance sampling is usually used to control

An acceptance sampling plan is to be designed to meet the organization's targets for product quality and risk levels.Which of the following is true?

Averages of small samples,not individual measurements,are generally used in statistical process control.

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