Question 1

The range measures the variation within samples versus the variation between samples.

Accepted Answer

A) True 
 B)False

Question 2

The process capability index is used only for p and c charts while the process capability ratio is used only for   and R charts.

Accepted Answer

A) True 
 B)False

Question 3

The simplest form of a sampling plan is a single-sample attribute plan.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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 significantly above the centre line. 
C)  the points are randomly distributed following a normal population. 
D)  no pattern exists in the plotted points (no evidence of a run). 
A)  no points are outside the control limits. 
B)  all points are significantly above the centre line. 
C)  the points are randomly distributed following a normal population. 
D)  no pattern exists in the plotted points (no evidence of a run).

Question 6

Explain the importance of control chart patterns and give several examples for patterns.

Accepted Answer

Even though a control chart may indicate

Question 7

A control chart that reflects the amount of dispersion, or spread, present within each sample is known as a(n)

Accepted Answer

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

Question 8

When special cause variation is detected, it is normally eliminated by increasing the number of standard deviations (z value) used to calculate the control limits.

Accepted Answer

A) True 
 B)False

Question 9

When calculating control limits for a process, the number of standard deviations (z value) is typically six.

Accepted Answer

A) True 
 B)False

Question 10

The acceptable quality level is

Accepted Answer

A)  the maximum number of defective items a consumer will accept in a lot. 
B)  an acceptable proportion of defective items in a lot to the consumer. 
C)  the minimum number of defective items a consumer will accept in a lot. 
D)  none of the above. 
A)  the maximum number of defective items a consumer will accept in a lot. 
B)  an acceptable proportion of defective items in a lot to the consumer. 
C)  the minimum number of defective items a consumer will accept in a lot. 
D)  none of the above.

Question 11

The consumer's risk is the probability of rejecting a lot that meets the acceptable quality level (AQL).

Accepted Answer

A) True 
 B)False

Question 12

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

Question 13

A pattern test can identify an out-of-control process even if all sample points are within control limits.

Accepted Answer

A) True 
 B)False

Question 14

Six Sigma companies report

Accepted Answer

A)  defective parts per million. 
B)  defective parts per thousand. 
C)  defective parts per hundred. 
D)  no defective parts. 
A)  defective parts per million. 
B)  defective parts per thousand. 
C)  defective parts per hundred. 
D)  no defective parts.

Question 15

If the quality of a process's output is determined by the average value of a sample, use a(n) ___ control chart.

Accepted Answer

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

Question 16

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. The process capability index for this process, with z = 3, is

Accepted Answer

A)  1.50. 
B)  -1.50. 
C)  1.83. 
D)  -1.83. 
A)  1.50. 
B)  -1.50. 
C)  1.83. 
D)  -1.83.

Question 17

Using control charts, how do we evaluate whether a process is in control?

Accepted Answer

Sample points are plotted on the control

Question 18

Two types of variation associated with the output of a process are common (random) cause and special cause.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

The range measures the variation within samples versus the variation between samples.

The process capability index is used only for p and c charts while the process capability ratio is used only for and R charts.

The simplest form of a sampling plan is a single-sample attribute plan.

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

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

Explain the importance of control chart patterns and give several examples for patterns.

A control chart that reflects the amount of dispersion, or spread, present within each sample is known as a(n)

When special cause variation is detected, it is normally eliminated by increasing the number of standard deviations (z value) used to calculate the control limits.

When calculating control limits for a process, the number of standard deviations (z value) is typically six.

The acceptable quality level is

The consumer's risk is the probability of rejecting a lot that meets the acceptable quality level (AQL).

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

A pattern test can identify an out-of-control process even if all sample points are within control limits.

Six Sigma companies report

If the quality of a process's output is determined by the average value of a sample, use a(n) ___ control chart.

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. The process capability index for this process, with z = 3, is

Using control charts, how do we evaluate whether a process is in control?

Two types of variation associated with the output of a process are common (random) cause and special cause.

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

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

Introduction to Operations and Supply Chain Management

Quality Management

Product Design

Service Design

Processes and Technology

Capacity and Facilities Design

Human Resources

Project Management

Supply Chain Management Strategy and Design

Global Supply Chain Procurement and Distribution

Forecasting

Inventory Management

Sales and Operations Planning

Resource Planning

Lean Systems

Scheduling

Filters

Exam 3: Statistical Process Control

The range measures the variation within samples versus the variation between samples.

The process capability index is used only for p and c charts while the process capability ratio is used only for and R charts.

The simplest form of a sampling plan is a single-sample attribute plan.

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

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

Explain the importance of control chart patterns and give several examples for patterns.

A control chart that reflects the amount of dispersion, or spread, present within each sample is known as a(n)

When special cause variation is detected, it is normally eliminated by increasing the number of standard deviations (z value) used to calculate the control limits.

When calculating control limits for a process, the number of standard deviations (z value) is typically six.

The acceptable quality level is

The consumer's risk is the probability of rejecting a lot that meets the acceptable quality level (AQL).

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

A pattern test can identify an out-of-control process even if all sample points are within control limits.

Six Sigma companies report

If the quality of a process's output is determined by the average value of a sample, use a(n) ___ control chart.

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. The process capability index for this process, with z = 3, is

Using control charts, how do we evaluate whether a process is in control?

Two types of variation associated with the output of a process are common (random) cause and special cause.

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

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

Introduction to Operations and Supply Chain Management

Quality Management

Product Design

Service Design

Processes and Technology

Capacity and Facilities Design

Human Resources

Project Management

Supply Chain Management Strategy and Design

Global Supply Chain Procurement and Distribution

Forecasting

Inventory Management

Sales and Operations Planning

Resource Planning

Lean Systems

Scheduling

Filters