Question 1

What is the sample mean service life for sample 2?

Accepted Answer

A)  470 hours 
B)  495 hours 
C)  500 hours 
D)  515 hours 
E)  525 hours 
A)  470 hours 
B)  495 hours 
C)  500 hours 
D)  515 hours 
E)  525 hours

Question 2

If he uses upper and lower control limits of 23 and 17 ounces,on what day(s),if any,does this process appear to be out of control?

Accepted Answer

A)  Monday 
B)  Tuesday 
C)  Monday and Tuesday 
D)  Monday, Tuesday, and Thursday 
E)  None of the choices are correct. 
A)  Monday 
B)  Tuesday 
C)  Monday and Tuesday 
D)  Monday, Tuesday, and Thursday 
E)  None of the choices are correct.

Question 3

Control charts based on attribute data are for process characteristics that are counted rather than measured.

Accepted Answer

A) True 
 B)False

Question 4

Given the following process control data for a normally distributed quality variable (three samples of size four each):
  
-If the process is known to have a mean of 15 and a standard deviation of 3,what is the mean of the sampling distribution of sample means for whenever this process is under control?
 The standard deviation?

Accepted Answer

The answer of Given the following process control data for...

Question 5

Process variability is a key factor in process capability.

Accepted Answer

A) True 
 B)False

Question 6

The range chart (R-chart)is most likely to detect a change in:

Accepted Answer

A)  proportion. 
B)  mean. 
C)  number defective. 
D)  process variability. 
E)  sample size. 
A)  proportion. 
B)  mean. 
C)  number defective. 
D)  process variability. 
E)  sample size.

Question 7

Given the following process control data for a normally distributed quality variable (three samples of size four each):
  
-If the process is known to have a mean of 15 and a standard deviation of 3,what is the alpha risk (probability of Type I error)for upper and lower control limits of 16.5 and 13.5 respectively?
 18 and 12?
 19.5 and 10.5?

Accepted Answer

The answer of Given the following process control data for...

Question 8

Approximately 99.7% of sample means will fall within ± two standard deviations of the process mean.

Accepted Answer

A) True 
 B)False

Question 9

The probability of concluding that an assignable variation exists when only random variation is present is:
I.the probability of a Type I error.
II.known as the alpha risk.
III.highly unlikely.
IV.the sum of probabilities in the two tails of the distribution.

Accepted Answer

A)  I and II only 
B)  I and IV only 
C)  II and III only 
D)  I, II, and IV 
E)  I, III, and IV 
A)  I and II only 
B)  I and IV only 
C)  II and III only 
D)  I, II, and IV 
E)  I, III, and IV

Question 10

Control limits are determined based on design specification limits.

Accepted Answer

A) True 
 B)False

Question 11

There is no direct link between design specifications and statistical process control limits.

Accepted Answer

A) True 
 B)False

Question 12

Control limits are specifications established by engineering design or customer requirements.

Accepted Answer

A) True 
 B)False

Question 13

A c-chart is used to monitor the number of defectives in the output of a process.

Accepted Answer

A) True 
 B)False

Question 14

The specification limits for a product are 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 choices are correct. 
A)  3.33 
B)  1.67 
C)  0.83 
D)  2.50 
E)  None of the choices are correct.

Question 15

The optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Accepted Answer

A) True 
 B)False

Question 16

Concluding that a process has not changed when it has is known as a Type I error.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

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

Question 18

Which of the following quality control sample statistics measures a quality characteristic which is an attribute?

Accepted Answer

A)  Mean 
B)  Variance 
C)  Standard deviation 
D)  Range 
E)  Proportion 
A)  Mean 
B)  Variance 
C)  Standard deviation 
D)  Range 
E)  Proportion

Question 19

The probability of a Type I error is the probability of concluding that assignable variation is present even though only random variation exists.

Accepted Answer

A) True 
 B)False

Question 20

Quality control efforts that occur during production are referred to as statistical process control.

Accepted Answer

A) True 
 B)False

Exam 10: A: Statistical Quality Control

What is the sample mean service life for sample 2?

If he uses upper and lower control limits of 23 and 17 ounces,on what day(s),if any,does this process appear to be out of control?

Control charts based on attribute data are for process characteristics that are counted rather than measured.

Process variability is a key factor in process capability.

The range chart (R-chart)is most likely to detect a change in:

Approximately 99.7% of sample means will fall within ± two standard deviations of the process mean.

The probability of concluding that an assignable variation exists when only random variation is present is: I.the probability of a Type I error. II.known as the alpha risk. III.highly unlikely. IV.the sum of probabilities in the two tails of the distribution.

Control limits are determined based on design specification limits.

There is no direct link between design specifications and statistical process control limits.

Control limits are specifications established by engineering design or customer requirements.

A c-chart is used to monitor the number of defectives in the output of a process.

The specification limits for a product are 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?

The optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Concluding that a process has not changed when it has is known as a Type I error.

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

Which of the following quality control sample statistics measures a quality characteristic which is an attribute?

The probability of a Type I error is the probability of concluding that assignable variation is present even though only random variation exists.

Quality control efforts that occur during production are referred to as statistical process control.

Introduction to Operations Management

Competitiveness, Strategic Planning, and Productivity

Demand Forecasting

A: Product Design

B: Product Design

A: Strategic Capacity Planning

B: Strategic Capacity Planning

A: Process Design and Facility Layout

B: Process Design and Facility Layout

A: Design of Work Systems

B: Design of Work Systems

A: Location Planning and Analysis

B: Location Planning and Analysis

Management of Quality

B: Statistical Quality Control

Supply Chain Management

Inventory Management

Aggregate Operations Planning

Material Requirements Planning and Enterprise Resource Planning

A: Just-In-Time and Lean Production

B: Just-In-Time and Lean Production

Job and Staff Scheduling

Project Management

A: Waiting-Line Analysis

B: Waiting-Line Analysis

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