Question 1

Which of the following control charts are often based on sample sizes larger than one hundred?

Accepted Answer

A)    
B) R 
C) c 
D) p 
A)    
B) R 
C) c 
D) p

Question 2

A company manufactures a product that has a design (nominal)target width of 5 inches with tolerances of + .05 inch.The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch.The process capability index for this process is

Accepted Answer

A) 1.67. 
B) 1.5. 
C) -1.5. 
D) -1.67. 
A) 1.67. 
B) 1.5. 
C) -1.5. 
D) -1.67.

Question 3

Which of the following statements is true?

Accepted Answer

A) With wider control limits (larger Z),the process is more likely to be in control. 
B) With narrower control limits,(smaller Z),the process is more likely to be in control. 
C) With wider control limits (larger Z),the process is less likely to be in control. 
D) None of the above are true. 
A) With wider control limits (larger Z),the process is more likely to be in control. 
B) With narrower control limits,(smaller Z),the process is more likely to be in control. 
C) With wider control limits (larger Z),the process is less likely to be in control. 
D) None of the above are true.

Question 4

Design specification limits should always be wider than the control limits for a given process.

Accepted Answer

A) True 
 B)False

Question 5

Two types of variation associated with the output of a process are common (random)cause and special cause.

Accepted Answer

A) True 
 B)False

Question 6

Briefly discuss attribute and qualitative variable quality measures.

Accepted Answer

The quality of a product or service can

Question 7

Using Excel to construct control charts should be avoided because most people believe using software results in too many errors.

Accepted Answer

A) True 
 B)False

Question 8

The goal of statistical process control is to ensure that the control limits and specifications limits for a process always remain the same.

Accepted Answer

A) True 
 B)False

Question 9

Some companies that strive to provide extremely high quality use Z=6 (six sigma)vs.Z=3 (three sigma)when constructing control limits.

Accepted Answer

A) True 
 B)False

Question 10

A process is generally considered to be in control when

Accepted Answer

A) there are no sample points outside the control limits. 
B) most points are near the centre line,without many being close to the control limits. 
C) sample points are randomly distributed equally above and below the centre line. 
D) all of the above are true. 
A) there are no sample points outside the control limits. 
B) most points are near the centre line,without many being close to the control limits. 
C) sample points are randomly distributed equally above and below the centre line. 
D) all of the above are true.

Question 11

For a given process,the process capability ratio is not related to its control limits.

Accepted Answer

A) True 
 B)False

Question 12

Only certified statisticians should use Excel to construct a control chart for a process.

Accepted Answer

A) True 
 B)False

Question 13

If the points plotted on a control chart display a pattern,it is called a run.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following control charts is used to control the variation between samples?

Accepted Answer

A)    
B) R 
C) c 
D) p 
A)    
B) R 
C) c 
D) p

Question 15

For the process to be capable of meeting design specification,the process capability index must be

Accepted Answer

A) less than one (1.0). 
B) equal to or greater than one (1.0). 
C) smaller than Six Sigma. 
D) larger than Six Sigma. 
A) less than one (1.0). 
B) equal to or greater than one (1.0). 
C) smaller than Six Sigma. 
D) larger than Six Sigma.

Question 16

Common cause (random)variation provides evidence that the process is not in control.

Accepted Answer

A) True 
 B)False

Question 17

A process that is determined to be in control contains no variation.

Accepted Answer

A) True 
 B)False

Question 18

An   and R-chart constructed to monitor and control a process use same raw data.

Accepted Answer

A) True 
 B)False

Question 19

The individual that detects special cause variation in a process is not allowed to diagnose the root cause and correct it.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is not a characteristic of a control chart?

Accepted Answer

A) The centre line is determined using special cause variations. 
B) The upper and lower control limits are based on special cause variation. 
C) The centre line is determined by using the target value. 
D) None of the above are true. 
A) The centre line is determined using special cause variations. 
B) The upper and lower control limits are based on special cause variation. 
C) The centre line is determined by using the target value. 
D) None of the above are true.

Exam 3: Statistical Process Control

Which of the following control charts are often based on sample sizes larger than one hundred?

A company manufactures a product that has a design (nominal)target width of 5 inches with tolerances of + .05 inch.The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch.The process capability index for this process is

Which of the following statements is true?

Design specification limits should always be wider than the control limits for a given process.

Two types of variation associated with the output of a process are common (random)cause and special cause.

Briefly discuss attribute and qualitative variable quality measures.

Using Excel to construct control charts should be avoided because most people believe using software results in too many errors.

The goal of statistical process control is to ensure that the control limits and specifications limits for a process always remain the same.

Some companies that strive to provide extremely high quality use Z=6 (six sigma)vs.Z=3 (three sigma)when constructing control limits.

A process is generally considered to be in control when

For a given process,the process capability ratio is not related to its control limits.

Only certified statisticians should use Excel to construct a control chart for a process.

If the points plotted on a control chart display a pattern,it is called a run.

Which of the following control charts is used to control the variation between samples?

For the process to be capable of meeting design specification,the process capability index must be

Common cause (random)variation provides evidence that the process is not in control.

A process that is determined to be in control contains no variation.

An and R-chart constructed to monitor and control a process use same raw data.

The individual that detects special cause variation in a process is not allowed to diagnose the root cause and correct it.

Which of the following is not a characteristic of a control chart?

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