Question 1

A p-chart is appropriate to plot the number of typographic errors per page of text.

Accepted Answer

A) True 
 B)False

Question 2

Why do range charts exist? Aren't x-bar charts enough?

Accepted Answer

Range charts and mean charts perform dif

Question 3

What is the purpose of the Operating Characteristics curve?

Accepted Answer

An OC curve plots the probabil

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

What is the difference between the process capability ratio Cp and the process capability index Cpk?

Accepted Answer

The Cp ratio does not consider how well

Question 6

In statistical process control,the range is often used as a substitute for the standard deviation.

Accepted Answer

A) True 
 B)False

Question 7

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

What does it mean for a process to be "capable"?

Accepted Answer

Process capability refers to t

Question 10

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

Accepted Answer

LCL = 0,an

Question 11

The c-chart signals whether there has been a:

Accepted Answer

A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ. 
A) gain or loss in uniformity. 
B) change in the number of defects per unit. 
C) change in the central tendency of the process output. 
D) change in the percent defective in a sample. 
E) change in the AOQ.

Question 12

The ________ -chart is the chief way to control attributes.

Accepted Answer

The answer of The ________ -chart is the chief way...

Question 13

Consumer's risk is the probability of:

Accepted Answer

A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above 
A) accepting a good lot. 
B) rejecting a good lot. 
C) rejecting a bad lot. 
D) accepting a bad lot. 
E) none of the above

Question 14

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 15

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 16

What is the difference between natural and assignable causes of variation?

Accepted Answer

Natural variations are those variations

Question 17

Which of the following statements about acceptance sampling is TRUE?

Accepted Answer

A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) All of the above are true. 
A) The steeper an OC curve,the better it discriminates between good and bad lots. 
B) Acceptance sampling removes all defective items. 
C) Acceptance sampling of incoming lots is replacing statistical process control at the supplier. 
D) Acceptance sampling occurs continuously along the assembly line. 
E) All of the above are true.

Question 18

The x-bar chart,like the c-chart,is based on the exponential distribution.

Accepted Answer

A) True 
 B)False

Question 19

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

Accepted Answer

The Cp ratio does not consider how well

Question 20

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

Accepted Answer

A) True 
 B)False

Exam 20: Statistical Process Control

A p-chart is appropriate to plot the number of typographic errors per page of text.

Why do range charts exist? Aren't x-bar charts enough?

What is the purpose of the Operating Characteristics curve?

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

What is the difference between the process capability ratio Cp and the process capability index Cpk?

In statistical process control,the range is often used as a substitute for the standard deviation.

An acceptance sampling plan must define "good lots" and "bad lots" and specify the risk level associated with each one.

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

What does it mean for a process to be "capable"?

Repeated sampling of a certain process shows the average of all sample ranges to be 1.0 cm.The sample size has been constant at n = 5.What are the 3-sigma control limits for this R-chart?

The c-chart signals whether there has been a:

The ________ -chart is the chief way to control attributes.

Consumer's risk is the probability of:

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

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

What is the difference between natural and assignable causes of variation?

Which of the following statements about acceptance sampling is TRUE?

The x-bar chart,like the c-chart,is based on the exponential distribution.

A process is operating in such a manner that the mean of the process is exactly on the lower specification limit.What must be true about the two measures of capability for this process?

In acceptance sampling,a manager can reach the wrong conclusion if the sample is not representative of the population it was drawn from.

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