Question 1

A p-chart would potentially be used to monitor the diameters of bolts made by a bolt manufacturing plant.

Accepted Answer

A) True 
 B)False

Question 2

Process control charts are used to provide signals to indicate when the output of a process is out of control.

Accepted Answer

A) True 
 B)False

Question 3

Because variations are unavoidable in a system, the output of the system is always unpredictable.

Accepted Answer

A) True 
 B)False

Question 4

Increased variation in processes and products can be detected as finer gauge measurement devices are used.

Accepted Answer

A) True 
 B)False

Question 5

The six most common sources of variation are people, machines, materials, methods, measurement, and environment.

Accepted Answer

A) True 
 B)False

Question 6

The control limits in a control chart can be interpreted to mean:

Accepted Answer

A)  any value falling outside the limits is a defect and the product should be discarded. 
B)  the range of virtually all special cause variation. 
C)  any value falling within the limits means the product is high quality. 
D)  the range of virtually all common cause variation. 
A)  any value falling outside the limits is a defect and the product should be discarded. 
B)  the range of virtually all special cause variation. 
C)  any value falling within the limits means the product is high quality. 
D)  the range of virtually all common cause variation.

Question 7

Special cause variation is variation in the output of a process that is naturally occurring and expected and that may be the result of random causes.

Accepted Answer

A) True 
 B)False

Question 8

Explain the relationship between control limits and specification limits.

Accepted Answer

Control limits are computed from data co

Question 9

Recently a shipping company took 30 samples, each of size n = 100, of packages that it was responsible for delivering. Out of the 3,000 total packages, 300 were delivered late. In setting up an appropriate process control chart, what would be the correct 3-sigma upper control limit value?

Accepted Answer

A)  0.03 
B)  0.13 
C)  0.19 
D)  0.07 
A)  0.03 
B)  0.13 
C)  0.19 
D)  0.07

Question 10

In process improvement efforts, the goal is to first remove the common cause variation and then to reduce the special cause variation in a system.

Accepted Answer

A) True 
 B)False

Question 11

It is entirely possible for the R-chart to show that a process is in statistical control and the -chart to show that the same process is out of control.

Accepted Answer

A) True 
 B)False

Question 12

A company that fills soft drinks into bottles wishes to establish an -chart to monitor the average fill level in the bottles. To do this, the company has taken a series of samples of size n = 4 bottles. The overall average fill is 12.03 ounces. The average range for the subgroups has been .06 ounces. Based on this information, what is the upper limit of the 3-sigma control limit?

Accepted Answer

A)  .729 
B)  .0437 
C)  12.09 
D)  12.074 
A)  .729 
B)  .0437 
C)  12.09 
D)  12.074

Question 13

Which of the following is not among the most common sources of variation?

Accepted Answer

A)  People 
B)  Materials 
C)  Methods 
D)  Quotas 
A)  People 
B)  Materials 
C)  Methods 
D)  Quotas

Question 14

Statistical Process Control charts are used to detect whether a process remains in control or whether it has gone out of control. Explain how the SPC signals work.

Accepted Answer

The control limits on an SPC chart are t

Question 15

The frequency distribution of most processes' statistics will begin to resemble the shape of the normal distribution as the values are collected and grouped into classes.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following in not an out of control signal for an x-bar chart?

Accepted Answer

A)  One or more points outside the control limits 
B)  Seven or more consecutive points that all fall on the same side of the center line 
C)  Six or more consecutive points moving in the same direction (an upward or downward trend) 
D)  Fourteen points in a row, alternating up and down 
A)  One or more points outside the control limits 
B)  Seven or more consecutive points that all fall on the same side of the center line 
C)  Six or more consecutive points moving in the same direction (an upward or downward trend) 
D)  Fourteen points in a row, alternating up and down

Question 17

Both p-charts and c-charts are designed for use when the data we are working with are referred to as attribute data.

Accepted Answer

A) True 
 B)False

Question 18

The x-bar chart is based on the principles of which distribution?

Accepted Answer

A)  t-distribution 
B)  Chi square distribution 
C)  F distribution 
D)  Normal distribution 
A)  t-distribution 
B)  Chi square distribution 
C)  F distribution 
D)  Normal distribution

Question 19

A company that fills soft drinks into bottles has established an -chart and an R-chart to monitor the average fill level in the bottles. To do this, the company has taken a series of samples of size n = 4 bottles. The overall average fill is 12.03 ounces. The average range for the subgroups has been .06 ounces. Suppose, after developing the control chart, a subgroup of size 4 yields a sample mean of 12.09 ounces and a range of .08, which of the following statements is true?

Accepted Answer

A)  The process is in control on both the -chart and the R-chart. 
B)  The process is out of control on the R-chart but in control on the -chart. 
C)  The process is out of control on the -chart but in control on the R-chart. 
D)  The process is out of control on both the -chart and the R-chart. 
A)  The process is in control on both the -chart and the R-chart. 
B)  The process is out of control on the R-chart but in control on the -chart. 
C)  The process is out of control on the -chart but in control on the R-chart. 
D)  The process is out of control on both the -chart and the R-chart.

Question 20

Total process variation is made up of the sum of common cause variation and special cause variation.

Accepted Answer

A) True 
 B)False

A p-chart would potentially be used to monitor the diameters of bolts made by a bolt manufacturing plant.

Process control charts are used to provide signals to indicate when the output of a process is out of control.

Because variations are unavoidable in a system, the output of the system is always unpredictable.

Increased variation in processes and products can be detected as finer gauge measurement devices are used.

The six most common sources of variation are people, machines, materials, methods, measurement, and environment.

The control limits in a control chart can be interpreted to mean:

Special cause variation is variation in the output of a process that is naturally occurring and expected and that may be the result of random causes.

Explain the relationship between control limits and specification limits.

Recently a shipping company took 30 samples, each of size n = 100, of packages that it was responsible for delivering. Out of the 3,000 total packages, 300 were delivered late. In setting up an appropriate process control chart, what would be the correct 3-sigma upper control limit value?

In process improvement efforts, the goal is to first remove the common cause variation and then to reduce the special cause variation in a system.

It is entirely possible for the R-chart to show that a process is in statistical control and the -chart to show that the same process is out of control.

Which of the following is not among the most common sources of variation?

Statistical Process Control charts are used to detect whether a process remains in control or whether it has gone out of control. Explain how the SPC signals work.

The frequency distribution of most processes' statistics will begin to resemble the shape of the normal distribution as the values are collected and grouped into classes.

Which of the following in not an out of control signal for an x-bar chart?

Both p-charts and c-charts are designed for use when the data we are working with are referred to as attribute data.

The x-bar chart is based on the principles of which distribution?

Total process variation is made up of the sum of common cause variation and special cause variation.

The Where, Why, and How of Data Collection

Graphs, Charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introducing Business Analytics

Introduction to Decision Analysis

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Exam 20: Introduction to Quality and Statistical Process Control

A p-chart would potentially be used to monitor the diameters of bolts made by a bolt manufacturing plant.

Process control charts are used to provide signals to indicate when the output of a process is out of control.

Because variations are unavoidable in a system, the output of the system is always unpredictable.

Increased variation in processes and products can be detected as finer gauge measurement devices are used.

The six most common sources of variation are people, machines, materials, methods, measurement, and environment.

The control limits in a control chart can be interpreted to mean:

Special cause variation is variation in the output of a process that is naturally occurring and expected and that may be the result of random causes.

Explain the relationship between control limits and specification limits.

Recently a shipping company took 30 samples, each of size n = 100, of packages that it was responsible for delivering. Out of the 3,000 total packages, 300 were delivered late. In setting up an appropriate process control chart, what would be the correct 3-sigma upper control limit value?

In process improvement efforts, the goal is to first remove the common cause variation and then to reduce the special cause variation in a system.

It is entirely possible for the R-chart to show that a process is in statistical control and the -chart to show that the same process is out of control.

Which of the following is not among the most common sources of variation?

Statistical Process Control charts are used to detect whether a process remains in control or whether it has gone out of control. Explain how the SPC signals work.

The frequency distribution of most processes' statistics will begin to resemble the shape of the normal distribution as the values are collected and grouped into classes.

Which of the following in not an out of control signal for an x-bar chart?

Both p-charts and c-charts are designed for use when the data we are working with are referred to as attribute data.

The x-bar chart is based on the principles of which distribution?

Total process variation is made up of the sum of common cause variation and special cause variation.

The Where, Why, and How of Data Collection

Graphs, Charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introducing Business Analytics

Introduction to Decision Analysis

Filters