Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Control charts visually show when a process is not within statistical control limits.

Accepted Answer

A) True 
 B)False

Question 3

A company produces a product which is designed to weigh 10 oz. ,with a tolerance of + 0.5 oz.The process produces products with an average weight of 9.95 oz.and a standard deviation of 0.10 oz.According to the process capability ratio is the process capable of meeting design specifications?

Accepted Answer

A) No,the process capability ratio is less than 1.0 
B) Yes,the process capability ratio is less than 1.0 
C) No,the process capability ratio is greater than 1.0 
D) Yes,the process capability ratio is greater than 1.0 
A) No,the process capability ratio is less than 1.0 
B) Yes,the process capability ratio is less than 1.0 
C) No,the process capability ratio is greater than 1.0 
D) Yes,the process capability ratio is greater than 1.0

Question 4

Pizazz manufactures a 5.0 oz.energy drink of the same name.Because the cans are so small,consumers are concerned that they are not receiving the full 5 ounces in each can.A quality engineer at the company is charged with analyzing the filling process and ensuring accurate readings.On 15 different occasions over the past month,she has taken a sample of 6 energy drinks off the production line and recorded their weight.If the sum of the sample means is 80.20 ounces and the sum of the sample ranges is 12.68 ounces,the UCL for an R-chart of this process would be

Accepted Answer

A) 0.0 
B) 1.0 
C) 1.7 
D) 2.4 
A) 0.0 
B) 1.0 
C) 1.7 
D) 2.4

Question 5

Which of the following control charts are based on sample sizes as small as one?

Accepted Answer

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

Question 6

Statistical process control is based on a philosophy of inspection as opposed to prevention.

Accepted Answer

A) True 
 B)False

Question 7

Common (random)variation of a process depends on all the following except

Accepted Answer

A) errors due to lack of training. 
B) the equipment and machinery used. 
C) the operator. 
D) system used for measurement. 
A) errors due to lack of training. 
B) the equipment and machinery used. 
C) the operator. 
D) system used for measurement.

Question 8

In general,a process is considered to be in control for all the following conditions except

Accepted Answer

A) no points are outside the control limits 
B) all points are above the centerline 
C) the points are randomly distributed following a normal population 
D) no pattern exists in the plotted points 
A) no points are outside the control limits 
B) all points are above the centerline 
C) the points are randomly distributed following a normal population 
D) no pattern exists in the plotted points

Question 9

Process control charts are often used at a critical point after which it is difficult to correct or rework the process output.

Accepted Answer

A) True 
 B)False

Question 10

It is sometimes not necessary to determine new control limits after special cause (nonrandom)variation has been identified if the source has been eliminated without changing the process.

Accepted Answer

A) True 
 B)False

Question 11

When a control chart detects no special cause (nonrandom)variation in a process,the upper and lower control limits are the same value.

Accepted Answer

A) True 
 B)False

Question 12

The process capability index indicates how much a process mean differs from the target specification value.

Accepted Answer

A) True 
 B)False

Question 13

For a p-chart,UCL = 0.58 and LCL = 0.26.Then the overall percentage of compliant items is ______%.

Accepted Answer

A) There is not enough information to determine q 
B) 58 
C) 42 
D) 16 
A) There is not enough information to determine q 
B) 58 
C) 42 
D) 16

Question 14

Marble Inc.makes countertops from a variety of high-end materials.To monitor the quality of its production processes the company randomly selects one countertop and counts the number of blemishes.The results for ten samples are shown below:   Given the sample information above,the standard deviation of the number of defects for this process would be

Accepted Answer

A) 16 
B) 10 
C) 4 
D) 0 
A) 16 
B) 10 
C) 4 
D) 0

Question 15

A process capability ratio greater than one shows that a process is capable of producing output within its specification limits.

Accepted Answer

A) True 
 B)False

Question 16

Marble Inc.makes countertops from a variety of high-end materials.To monitor the quality of its production processes the company randomly selects one countertop and counts the number of blemishes.The results for ten samples are shown below:   Given the sample information above,the LCL using sigma = 3 for this process would be

Accepted Answer

A) 12 
B) 8 
C) 4 
D) 0 
A) 12 
B) 8 
C) 4 
D) 0

Question 17

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

Accepted Answer

A) the centerline is determined using special cause (nonrandom)variations. 
B) the upper and lower control limits are based on special cause (nonrandom)variation. 
C) the centerline is determined by using the target value. 
D) None of these answer choices is correct. 
A) the centerline is determined using special cause (nonrandom)variations. 
B) the upper and lower control limits are based on special cause (nonrandom)variation. 
C) the centerline is determined by using the target value. 
D) None of these answer choices is correct.

Question 18

A company randomly selects 100 light bulbs every day for 40 days from its production process.If 600 defective light bulbs are found in the sampled bulbs then the 3-sigma lower control limit would be

Accepted Answer

A) 0.0357 
B) 0.0429 
C) 0.1500 
D) 0.1857 
A) 0.0357 
B) 0.0429 
C) 0.1500 
D) 0.1857

Question 19

One goal of statistical process control is to prevent a process from producing items that have to be scrapped or reworked.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following control charts is based on the number of defects within a sample?

Accepted Answer

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

Exam 4: Statistical Process Control

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

Control charts visually show when a process is not within statistical control limits.

A company produces a product which is designed to weigh 10 oz. ,with a tolerance of + 0.5 oz.The process produces products with an average weight of 9.95 oz.and a standard deviation of 0.10 oz.According to the process capability ratio is the process capable of meeting design specifications?

Which of the following control charts are based on sample sizes as small as one?

Statistical process control is based on a philosophy of inspection as opposed to prevention.

Common (random)variation of a process depends on all the following except

In general,a process is considered to be in control for all the following conditions except

Process control charts are often used at a critical point after which it is difficult to correct or rework the process output.

It is sometimes not necessary to determine new control limits after special cause (nonrandom)variation has been identified if the source has been eliminated without changing the process.

When a control chart detects no special cause (nonrandom)variation in a process,the upper and lower control limits are the same value.

The process capability index indicates how much a process mean differs from the target specification value.

For a p-chart,UCL = 0.58 and LCL = 0.26.Then the overall percentage of compliant items is ______%.

A process capability ratio greater than one shows that a process is capable of producing output within its specification limits.

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

A company randomly selects 100 light bulbs every day for 40 days from its production process.If 600 defective light bulbs are found in the sampled bulbs then the 3-sigma lower control limit would be

One goal of statistical process control is to prevent a process from producing items that have to be scrapped or reworked.

Which of the following control charts is based on the number of defects within a sample?

Introduction to Operations and Supply Chain Management

Supplement Operational Decision-Making Tools: Decision Analysis

Quality Management

Supplement Operational Decision-Making Tools: Acceptance Sampling

Product Design

Service Design

Processes and Technology

Capacity and Facilities

Supplement Operational Decision-Making Tools: Facility Location Models

Human Resources

Supplement Operational Decision-Making Tools: Work Measurement

Project Management

Supply Chain Management Strategy and Design

Global Supply Chain Procurement and Distribution

Supplement Operational Decision-Making Tools: Transportation and Transshipment Models

Forecasting

Inventory Management

Supplement Operational Decision-Making Tools: Simulation

Sales and Operations Planning

Supplement Operational Decision-Making Tools: Linear Programming

Enterprise Resource Planning

Lean Systems

Scheduling

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