Question 1

A p-chart is used to monitor the fraction of defectives in the output of a process.

Accepted Answer

A) True 
 B)False

Question 2

An x-bar control chart can only be valid if the underlying population it measures is a normal distribution.

Accepted Answer

A) True 
 B)False  False

Question 3

A control chart used to monitor the process mean is the:

Accepted Answer

A)  p-chart
B)  R-chart
C)  x-bar chart
D)  c-chart
E)  Gantt chartF) B) and C)
G) A) and C)

Question 4

If the process is known to produce 11 percent defectives on average, what is the mean of the sampling distribution of sample proportions for whenever this process is under control? The standard deviation?

Accepted Answer

The answer of If the process is known to produce...

Question 5

What is the sample mean for sample #1? #2? #3?

Accepted Answer

The answer of What is the sample mean for sample...

Question 6

What is the estimate of the standard deviation of the sampling distribution of sample proportions for whenever this process is under control?

Accepted Answer

A)  .016
B)  .00016
C)  .04
D)  .0044
E)  .00002F) B) and D)
G) D) and E)

Question 7

A control chart used to monitor the number of defects per unit is the:

Accepted Answer

A)  p-chart
B)  R-chart
C)  x-bar chart
D)  c-chart
E)  Gantt chartF) All of the above
G) C) and D) D

Question 8

What is the mean of the sampling distribution of sample means when this process is under control?

Accepted Answer

A)  18 ounces
B)  19 ounces
C)  20 ounces
D)  21 ounces
E)  22 ouncesF) C) and D)
G) A) and E)

Question 9

An analyst has gathered data and counted the number of runs with respect to the median.There were 60 observations and 22 runs.What can the analyst conclude given this information?

Accepted Answer

The expected number of above/below runs would be

Question 10

The specification limit for a product is 8 cm and 10 cm.A process that produces the product has a mean of 9.5 cm and a standard deviation of 0.2 cm.What is the process capability, Cpk?

Accepted Answer

A)  3.33
B)  1.67
C)  0.83
D)  2.50
E)  none of the aboveF) D) and E)
G) B) and C)

Question 11

When a process is in control, it results in there being, on average, 16 defects per unit of output.C-chart limits of 8 and 24 would lead to a _______ chance of a Type I error.

Accepted Answer

A)  67%
B)  92%
C)  33%
D)  .03%
E)  5%F) A) and D)
G) C) and E)

Question 12

Which of the following quality control sample statistics indicates a quality characteristic that is an attribute?

Accepted Answer

A)  mean
B)  variance
C)  standard deviation
D)  range
E)  proportionF) C) and E)
G) B) and D)

Question 13

A shift in the process mean for a measured characteristic would most likely be detected by a:

Accepted Answer

A)  p-chart 
B)  x-bar chart
C)  c-chart
D)  R-chart
E)  s-chartF) A) and E)
G) B) and E)

Question 14

For upper and lower control limits of 23.29 and 16.71, which machine(s) , if any, appear(s)  to have an out-of-control process mean?

Accepted Answer

A)  machine #1
B)  machine #2
C)  machine #3
D)  all of the machines
E)  none of the machinesF) B) and D)
G) C) and D)

Question 15

Approving the effort that occurs during the production process is known as acceptance sampling.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following relationships must always be incorrect?

Accepted Answer

A) Tolerances > process variability > control limits
B) Process variability > tolerances > control limits
C) Tolerances > control limits > process variability
D) Process variability > control limits > tolerances
E) Process variability <Tolerances<control limits

F) C) and E)
G) B) and C)

Correct Answer
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Question 17

High-cost, low-volume items often require careful inspection since we make them so infrequently.

Accepted Answer

A) True 
 B)False

Question 18

Attribute data are counted, variable data are measured.

Accepted Answer

A) True 
 B)False

Question 19

Using .95 control limits, (5% risk of Type I error) , which instructor(s) , if any, should he conclude is (are)  out of control?

Accepted Answer

A)  none
B)  Prof.B
C)  Prof.D
D)  both Prof.B and Prof.D
E)  allF) A) and E)
G) C) and D)

Question 20

The best way to assure quality is to use extensive inspection and control charts.

Accepted Answer

A) True 
 B)False

Exam 10: Quality Control

A p-chart is used to monitor the fraction of defectives in the output of a process.

Correct AnswerverifiedShow Answer

An x-bar control chart can only be valid if the underlying population it measures is a normal distribution.

Correct AnswerverifiedFalse

A control chart used to monitor the process mean is the:

Correct AnswerverifiedShow Answer

If the process is known to produce 11 percent defectives on average, what is the mean of the sampling distribution of sample proportions for whenever this process is under control? The standard deviation?

Correct AnswerverifiedShow Answer

What is the sample mean for sample #1? #2? #3?

Correct AnswerverifiedShow Answer

What is the estimate of the standard deviation of the sampling distribution of sample proportions for whenever this process is under control?

Correct AnswerverifiedShow Answer

A control chart used to monitor the number of defects per unit is the:

Correct AnswerverifiedD

What is the mean of the sampling distribution of sample means when this process is under control?

Correct AnswerverifiedShow Answer

An analyst has gathered data and counted the number of runs with respect to the median.There were 60 observations and 22 runs.What can the analyst conclude given this information?

Correct AnswerverifiedThe expected number of above/below runs would be 11ea6d31_2da7_5fa6_ada9_19ed3aadda2f_TB2514_00

The specification limit for a product is 8 cm and 10 cm.A process that produces the product has a mean of 9.5 cm and a standard deviation of 0.2 cm.What is the process capability, Cpk?

Correct AnswerverifiedShow Answer

When a process is in control, it results in there being, on average, 16 defects per unit of output.C-chart limits of 8 and 24 would lead to a _______ chance of a Type I error.

Correct AnswerverifiedShow Answer

Which of the following quality control sample statistics indicates a quality characteristic that is an attribute?

Correct AnswerverifiedShow Answer

A shift in the process mean for a measured characteristic would most likely be detected by a:

Correct AnswerverifiedShow Answer

For upper and lower control limits of 23.29 and 16.71, which machine(s) , if any, appear(s) to have an out-of-control process mean?

Correct AnswerverifiedShow Answer

Approving the effort that occurs during the production process is known as acceptance sampling.

Correct AnswerverifiedShow Answer

Which of the following relationships must always be incorrect?

Correct AnswerverifiedShow Answer

High-cost, low-volume items often require careful inspection since we make them so infrequently.

Correct AnswerverifiedShow Answer

Attribute data are counted, variable data are measured.

Correct AnswerverifiedShow Answer

Using .95 control limits, (5% risk of Type I error) , which instructor(s) , if any, should he conclude is (are) out of control?

Correct AnswerverifiedShow Answer

The best way to assure quality is to use extensive inspection and control charts.

Correct AnswerverifiedShow Answer

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False

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D

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The expected number of above/below runs would be 11ea6d31_2da7_5fa6_ada9_19ed3aadda2f_TB2514_00

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