Question 1

If a process is performing as it should, it is still possible to obtain observations which are outside of which limits?
(I)tolerances(II)control limits(III)process variability

Accepted Answer

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

Question 2

Processes that are in control eliminate variations.

Accepted Answer

A) True 
 B)False

Question 3

This step in the control process includes sufficient detail about what is to be controlled.

Accepted Answer

A) define 
B) compare 
C) measure 
D) evaluate 
E) correct 
A) define 
B) compare 
C) measure 
D) evaluate 
E) correct

Question 4

Run tests are useful in helping to identify nonrandom variations in a process.

Accepted Answer

A) True 
 B)False

Question 5

The traditional view is that the optimum level of inspection is where the

Accepted Answer

A) cost of inspection is minimum. 
B) cost of passing defectives is minimum. 
C) total cost of inspection and defectives is maximum. 
D) total cost of inspection and defectives is minimum. 
E) difference between inspection and defectives costs is minimum. 
A) cost of inspection is minimum. 
B) cost of passing defectives is minimum. 
C) total cost of inspection and defectives is maximum. 
D) total cost of inspection and defectives is minimum. 
E) difference between inspection and defectives costs is minimum.

Question 6

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each
 
If he uses upper and lower control limits of 22 and 18 ounces, what is his risk (alpha)of concluding this process is out of control when it is actually in control (Type I error)?

Accepted Answer

A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544 
A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544

Question 7

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

Question 8

The traditional view is that the optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Accepted Answer

A) True 
 B)False

Question 9

The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are in control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results
 
What is the estimate of the standard deviation of the sampling distribution for an instructor's sample proportion of failures?

Accepted Answer

A) .0075 
B) .03 
C) .075 
D) .3 
E) .75 
A) .0075 
B) .03 
C) .075 
D) .3 
E) .75

Question 10

Studies on a bottle-filling machine indicate that it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the Cpk index of 1?

Accepted Answer

A) lower spec = 0.1 ounces and upper spec = 1 ounce 
B) lower spec = 14.3 ounces and upper spec = 17.7 ounces 
C) lower spec = 12.0 ounces and upper spec = 21.4 ounces 
D) lower spec = 15.7 ounces and upper spec = 16.3 ounces 
E) There is insufficient information to determine the process specification. 
A) lower spec = 0.1 ounces and upper spec = 1 ounce 
B) lower spec = 14.3 ounces and upper spec = 17.7 ounces 
C) lower spec = 12.0 ounces and upper spec = 21.4 ounces 
D) lower spec = 15.7 ounces and upper spec = 16.3 ounces 
E) There is insufficient information to determine the process specification.

Question 11

Concluding that a process is out of control when it is not is known as a Type I error.

Accepted Answer

A) True 
 B)False

Question 12

This step in the control process includes a standard that can be used to evaluate the measurements.

Accepted Answer

A) define 
B) compare 
C) measure 
D) evaluate 
E) correct 
A) define 
B) compare 
C) measure 
D) evaluate 
E) correct

Question 13

Statistical process control is the measurement of rejects in the final product.

Accepted Answer

A) True 
 B)False

Question 14

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results
 
If he uses upper and lower control limits of 520 and 480 hours, what is his risk (alpha)of concluding that service life is out of control when it is actually under control (Type I error)?

Accepted Answer

A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544 
A) 0.0026 
B) 0.0456 
C) 0.3174 
D) 0.6826 
E) 0.9544

Question 15

Cpk is useful even when the process is not centered.

Accepted Answer

A) True 
 B)False

Question 16

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results
 
What is the estimate of the mean of the sampling distribution for the sample mean?

Accepted Answer

A) 16 
B) 19 
C) 20 
D) 21 
E) 23 
A) 16 
B) 19 
C) 20 
D) 21 
E) 23

Question 17

The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are in control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results
 
What is the sample proportion of failures ( p)for Prof. D?

Accepted Answer

A) 0 
B) .04 
C) .11 
D) .13 
E) .16 
A) 0 
B) .04 
C) .11 
D) .13 
E) .16

Question 18

When a process is in control, it results in there being, on average, 16 defects per unit of output. chart limits of 4 and 28 would lead to a _____ percent chance of a Type I error.

Accepted Answer

A) 68.26 
B) 95.44 
C) 31.74 
D) 0.26 
E) 4.56 
A) 68.26 
B) 95.44 
C) 31.74 
D) 0.26 
E) 4.56

Question 19

A process that exhibits random variability would be judged to be out of control.

Accepted Answer

A) True 
 B)False

Question 20

The assurance that processes are performing in an acceptable manner is the focus of

Accepted Answer

A) variability analysis. 
B) inspection. 
C) capability assessment. 
D) quality control. 
E) acceptance sampling. 
A) variability analysis. 
B) inspection. 
C) capability assessment. 
D) quality control. 
E) acceptance sampling.

If a process is performing as it should, it is still possible to obtain observations which are outside of which limits? (I)tolerances(II)control limits(III)process variability

Processes that are in control eliminate variations.

This step in the control process includes sufficient detail about what is to be controlled.

Run tests are useful in helping to identify nonrandom variations in a process.

The traditional view is that the optimum level of inspection is where the

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

The traditional view is that the optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Studies on a bottle-filling machine indicate that it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the C_pk index of 1?

Concluding that a process is out of control when it is not is known as a Type I error.

This step in the control process includes a standard that can be used to evaluate the measurements.

Statistical process control is the measurement of rejects in the final product.

C_pk is useful even when the process is not centered.

When a process is in control, it results in there being, on average, 16 defects per unit of output. chart limits of 4 and 28 would lead to a _____ percent chance of a Type I error.

A process that exhibits random variability would be judged to be out of control.

The assurance that processes are performing in an acceptable manner is the focus of

Introduction to Operations Management

Competitiveness, Strategy, and Productivity

Forecasting

Product and Service Design

Strategic Capacity Planning for Products and Services

Process Selection and Facility Layout

Work Design and Measurement

Location Planning and Analysis

Management of Quality

Aggregate Planning and Master Scheduling

Inventory Management

MRP and ERP

Jit and Lean Operations

Supply Chain Management

Scheduling

Project Management

Management of Waiting Lines

Linear Programming

Filters

Exam 10: Quality Control

If a process is performing as it should, it is still possible to obtain observations which are outside of which limits? (I)tolerances(II)control limits(III)process variability

Processes that are in control eliminate variations.

This step in the control process includes sufficient detail about what is to be controlled.

Run tests are useful in helping to identify nonrandom variations in a process.

The traditional view is that the optimum level of inspection is where the

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

The traditional view is that the optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.

Studies on a bottle-filling machine indicate that it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the Cpk index of 1?

Concluding that a process is out of control when it is not is known as a Type I error.

This step in the control process includes a standard that can be used to evaluate the measurements.

Statistical process control is the measurement of rejects in the final product.

Cpk is useful even when the process is not centered.

When a process is in control, it results in there being, on average, 16 defects per unit of output. chart limits of 4 and 28 would lead to a _____ percent chance of a Type I error.

A process that exhibits random variability would be judged to be out of control.

The assurance that processes are performing in an acceptable manner is the focus of

Introduction to Operations Management

Competitiveness, Strategy, and Productivity

Forecasting

Product and Service Design

Strategic Capacity Planning for Products and Services

Process Selection and Facility Layout

Work Design and Measurement

Location Planning and Analysis

Management of Quality

Aggregate Planning and Master Scheduling

Inventory Management

MRP and ERP

Jit and Lean Operations

Supply Chain Management

Scheduling

Project Management

Management of Waiting Lines

Linear Programming

Filters

Studies on a bottle-filling machine indicate that it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the C_pk index of 1?

C_pk is useful even when the process is not centered.