Question 1

Statistical process control can prevent poor quality before it occurs if a pattern is evident in the plotted points.

Accepted Answer

A) True 
 B)False  True

Question 2

Common cause (random)variation provides evidence that the process is not in control.

Accepted Answer

A) True 
 B)False  False

Question 3

A control chart is in control when the plot of the sample points exhibits a pattern.

Accepted Answer

A) True 
 B)False  False

Question 4

Dumplings -To-Go (DTG)provides take-out dumplings and noodle dishes to customers at its chain of drive-through restaurants.The target for a customer's waiting time is 3.0 minutes +/- 1 minute.Each month,one of the managers observes the drive-through process and collects a sample of 4 waiting times a day over a 6 day period.The data from one restaurant appears below.If DTG were to construct an R-chart from this data,the centerline would be

Accepted Answer

A) 1.00 
B) 2.82 
C) 3.54 
D) 3.81 
A) 1.00 
B) 2.82 
C) 3.54 
D) 3.81

Question 5

Consider a production process that produces tires.A quality engineer has taken 15 samples,each containing 200 tires.The total number of defective tires over the 15 samples is 340.The centerline for the control chart is

Accepted Answer

A) 0.08 
B) 0.11 
C) 0.16 
D) 0.21 
A) 0.08 
B) 0.11 
C) 0.16 
D) 0.21

Question 6

Control charts are typically used at the ___________ of a process.

Accepted Answer

A) beginning. 
B) middle. 
C) end. 
D) All these answer choices are correct. 
A) beginning. 
B) middle. 
C) end. 
D) All these answer choices are correct.

Question 7

After special cause variation is detected,the focus changes to identifying the root cause of the variation and eliminating it.

Accepted Answer

A) True 
 B)False

Question 8

A process that is determined to be in control contains no variation.

Accepted Answer

A) True 
 B)False

Question 9

The formulas for determining the upper and lower control limits are based on the number of standard deviations,z,from the process average.Management usually selects a z value of _______.

Accepted Answer

A) one 
B) two 
C) three 
D) six 
A) one 
B) two 
C) three 
D) six

Question 10

An x-bar and R-chart constructed to monitor and control a process use the same raw data.

Accepted Answer

A) True 
 B)False

Question 11

Easy Tax is a service company that prepares tax returns.An outside auditor has examined 20 samples each containing one completed tax return.The total number of defects observed over the 20 samples is 200.The centerline for the control chart constructed is

Accepted Answer

A) 5 
B) 10 
C) 15 
D) 20 
A) 5 
B) 10 
C) 15 
D) 20

Question 12

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,what is the centerline of an R-chart for this process?

Accepted Answer

A) .50 
B) .85 
C) 1.20 
D) 1.55 
A) .50 
B) .85 
C) 1.20 
D) 1.55

Question 13

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 centerline for an X-bar chart of this process would be

Accepted Answer

A) 4.75 
B) 5.00 
C) 5.35 
D) 5.69 
A) 4.75 
B) 5.00 
C) 5.35 
D) 5.69

Question 14

Which of the following statements concerning control chart limits is true?

Accepted Answer

A) the smaller the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process 
B) the larger the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process 
C) the smaller the value of z,the wider the control limits are and the less sensitive the chart is to changes in the production process 
D) the larger the value of z,the more narrow the control limits are and the less sensitive the chart is to changes in the production process 
A) the smaller the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process 
B) the larger the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process 
C) the smaller the value of z,the wider the control limits are and the less sensitive the chart is to changes in the production process 
D) the larger the value of z,the more narrow the control limits are and the less sensitive the chart is to changes in the production process

Question 15

A p-chart is used to monitor the proportion defective in the output of a process.

Accepted Answer

A) True 
 B)False

Question 16

An attribute measure is a product characteristic such as

Accepted Answer

A) weight. 
B) color. 
C) length. 
D) time. 
A) weight. 
B) color. 
C) length. 
D) time.

Question 17

A process is generally considered to be in control when

Accepted Answer

A) there are no sample points outside the control limits 
B) most points are near the center line,without many being close to the control limits 
C) sample points are randomly distributed equally above and below the center line 
D) All of these answer choices are correct. 
A) there are no sample points outside the control limits 
B) most points are near the center line,without many being close to the control limits 
C) sample points are randomly distributed equally above and below the center line 
D) All of these answer choices are correct.

Question 18

If a sample point plotted on a control chart is outside the control limits

Accepted Answer

A) the evidence indicates the process is in control. 
B) the evidence indicates the process is out of control. 
C) the evidence is inconclusive. 
D) None of these answer choices is correct. 
A) the evidence indicates the process is in control. 
B) the evidence indicates the process is out of control. 
C) the evidence is inconclusive. 
D) None of these answer choices is correct.

Question 19

Consider a production process that produces tires.A quality engineer has taken 15 samples,each containing 200 tires.The total number of defective tires over the 15 samples is 340.The LCL for the control chat constructed using two sigma is

Accepted Answer

A) 0.022 
B) 0.036 
C) 0.048 
D) 0.066 
A) 0.022 
B) 0.036 
C) 0.048 
D) 0.066

Question 20

The basic purpose of control charts include(s)

Accepted Answer

A) establishing control limits for a process. 
B) monitoring the process to indicate when it is out of control. 
C) both establishing control limits for a process and monitoring the process to indicate when it is out of control are basic purposes. 
D) None of these answer choices is correct. 
A) establishing control limits for a process. 
B) monitoring the process to indicate when it is out of control. 
C) both establishing control limits for a process and monitoring the process to indicate when it is out of control are basic purposes. 
D) None of these answer choices is correct.

Exam 4: Statistical Process Control

Statistical process control can prevent poor quality before it occurs if a pattern is evident in the plotted points.

Common cause (random)variation provides evidence that the process is not in control.

A control chart is in control when the plot of the sample points exhibits a pattern.

Consider a production process that produces tires.A quality engineer has taken 15 samples,each containing 200 tires.The total number of defective tires over the 15 samples is 340.The centerline for the control chart is

Control charts are typically used at the ___________ of a process.

After special cause variation is detected,the focus changes to identifying the root cause of the variation and eliminating it.

A process that is determined to be in control contains no variation.

The formulas for determining the upper and lower control limits are based on the number of standard deviations,z,from the process average.Management usually selects a z value of _______.

An x-bar and R-chart constructed to monitor and control a process use the same raw data.

Easy Tax is a service company that prepares tax returns.An outside auditor has examined 20 samples each containing one completed tax return.The total number of defects observed over the 20 samples is 200.The centerline for the control chart constructed is

Which of the following statements concerning control chart limits is true?

A p-chart is used to monitor the proportion defective in the output of a process.

An attribute measure is a product characteristic such as

A process is generally considered to be in control when

If a sample point plotted on a control chart is outside the control limits

Consider a production process that produces tires.A quality engineer has taken 15 samples,each containing 200 tires.The total number of defective tires over the 15 samples is 340.The LCL for the control chat constructed using two sigma is

The basic purpose of control charts include(s)

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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