Question 1

Four samples of three observations each have been taken, with actual measurements (in centimeters) shown below.Construct three-sigma mean and range charts.

Accepted Answer

@#IMG-DLM& @#IMG-DLM& Control

Question 2

Suppose the long-run average of this coating process is 0.09 millimeters.Further suppose this process' standard deviation is 0.015 millimeters.What proportion of the output from this process will fail to meet specifications?

Accepted Answer

The answer of Suppose the long-run average of this coating...

Question 3

A c-chart is used to monitor the number of defects per unit for process output.

Accepted Answer

A) True 
 B)False

Question 4

What are the .95 (5% risk of Type I error) upper and lower control limits for the p-chart?

Accepted Answer

A) .95 and .05 
B) .13 and .07 
C) .1588 and .0412 
D) .16 and .04 
E) .1774 and .0226 
A) .95 and .05 
B) .13 and .07 
C) .1588 and .0412 
D) .16 and .04 
E) .1774 and .0226

Question 5

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

Accepted Answer

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

Question 6

If the process is known to produce 11 percent defectives on average, what is the alpha risk (probability of Type I error) for upper and lower control limits of .1256 and .0944 respectively? .1412 and .0788? .1568 and .0632?

Accepted Answer

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

Question 7

The number of runs up and down for the data above is:

Accepted Answer

A) 3 
B) 4 
C) 5 
D) 6 
E) none of these 
A) 3 
B) 4 
C) 5 
D) 6 
E) none of these

Question 8

The process capability index (Cpk) may mislead if: (I) the process is not stable.
(II) the process output is not normally distributed.
(III) the process is not centered.

Accepted Answer

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

Question 9

What is the estimate of the mean proportion of failures for these instructors?

Accepted Answer

A) .10 
B) .11 
C) .13 
D) .16 
E) .40 
A) .10 
B) .11 
C) .13 
D) .16 
E) .40

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 If the process is known to have...

Question 12

The specifications for a product are 6 mm  $\pm$0.1 mm.The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm.What is the Cpk for this process?

Accepted Answer

A) 3.33 
B) 1.67 
C) 5.00 
D) 2.50 
E) none of the above 
A) 3.33 
B) 1.67 
C) 5.00 
D) 2.50 
E) none of the above

Question 13

The purpose of statistical process control is to ensure that historical output is random.

Accepted Answer

A) True 
 B)False

Question 14

Attributes need to be measured, variable data can be counted.

Accepted Answer

A) True 
 B)False

Question 15

An R value of zero (on a range chart) means that the process must be in control since all sample values are equal.

Accepted Answer

A) True 
 B)False

Question 16

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 17

Control limits tend to be wider for more variable processes.

Accepted Answer

A) True 
 B)False

Question 18

Quality control is assuring that processes are performing in an acceptable manner.

Accepted Answer

A) True 
 B)False

Question 19

Range charts are used mainly with attribute data.

Accepted Answer

A) True 
 B)False

Question 20

Type I and Type II errors refer to the magnitude of variation from the standard.

Accepted Answer

A) True 
 B)False

Exam 10: Quality Control

Four samples of three observations each have been taken, with actual measurements (in centimeters) shown below.Construct three-sigma mean and range charts.

Suppose the long-run average of this coating process is 0.09 millimeters.Further suppose this process' standard deviation is 0.015 millimeters.What proportion of the output from this process will fail to meet specifications?

A c-chart is used to monitor the number of defects per unit for process output.

What are the .95 (5% risk of Type I error) upper and lower control limits for the p-chart?

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

If the process is known to produce 11 percent defectives on average, what is the alpha risk (probability of Type I error) for upper and lower control limits of .1256 and .0944 respectively? .1412 and .0788? .1568 and .0632?

The number of runs up and down for the data above is:

The process capability index (Cpk) may mislead if: (I) the process is not stable. (II) the process output is not normally distributed. (III) the process is not centered.

What is the estimate of the mean proportion of failures for these instructors?

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

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?

The specifications for a product are 6 mm ±\pm± 0.1 mm.The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm.What is the Cpk for this process?

The purpose of statistical process control is to ensure that historical output is random.

Attributes need to be measured, variable data can be counted.

An R value of zero (on a range chart) means that the process must be in control since all sample values are equal.

What is the sample proportion of failures (p) for Prof.D?

Control limits tend to be wider for more variable processes.

Quality control is assuring that processes are performing in an acceptable manner.

Range charts are used mainly with attribute data.

Type I and Type II errors refer to the magnitude of variation from the standard.

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

MRP and ERP

Inventory Management

Jit and Lean Operations

Supply Chain Management

Scheduling

Project Management

Management of Waiting Lines

Linear Programming

Extension 4: Reliability

Extension 5: Decision Theory

Extension 7: Learning Curves

Extension 8: The Transportation Model

Extension 10: Acceptance Sampling

Extension 14: Maintenance

Filters

The specifications for a product are 6 mm $\pm$ 0.1 mm.The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm.What is the Cpk for this process?