Question 1

A process may be in a state of control even if one sample mean is more than two standard deviations above the centerline.

Accepted Answer

A) True 
 B)False  True

Question 2

In general terms, a capable process is one whose variability (σ) is small in relation to the distance between the centerline μ and the upper and lower specification limits.

Accepted Answer

A) True 
 B)False  True

Question 3

Professor Murphy wants to set up a control chart to monitor the percentage of absenteeism in his introductory statistics course (50 students are registered). Absences per period for the last 15 class sessions are in the table below. $$\begin{array} { | l | c | c | c | c | c | c | c | c | c | c | c | c | c | c | c | } 
\hline \text { Session } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \
\hline \text { Absent } & 5 & 0 & 2 & 2 & 3 & 8 & 10 & 3 & 5 & 5 & 1 & 2 & 0 & 2 & 3 \
\hline
\end{array}$$ Calculate the empirical centerline for a p-chart to track absences.

Accepted Answer

A) .068 
B) .072 
C) .146 
D) .202 
A) .068 
B) .072 
C) .146 
D) .202 A

Question 4

Professor Murphy wants to set up a control chart to monitor the percentage of absenteeism in his introductory statistics course (50 students are registered). Absences per period for the last 15 class sessions are in the table below. $$\begin{array} { | l | c | c | c | c | c | c | c | c | c | c | c | c | c | c | c | } 
\hline \text { Session } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \
\hline \text { Absent } & 5 & 0 & 2 & 2 & 3 & 8 & 10 & 3 & 5 & 5 & 1 & 2 & 0 & 2 & 3 \
\hline
\end{array}$$ Using 3 sigma limits, calculate lower and upper control limits for a p-chart to track absences.

Accepted Answer

A) 0, .252 
B) 0, .175 
C) 0, .114 
D) -0.038, .272 
A) 0, .252 
B) 0, .175 
C) 0, .114 
D) -0.038, .272

Question 5

In manufacturing, if workers readjust the equipment after each sample, it would typically:

Accepted Answer

A) increase variation. 
B) decrease variation. 
C) widen the specification limits. 
D) improve conformance to specifications. 
A) increase variation. 
B) decrease variation. 
C) widen the specification limits. 
D) improve conformance to specifications.

Question 6

Control charts (SPC charts) are attributed to:

Accepted Answer

A) Deming. 
B) Shewhart. 
C) Juran. 
D) Taguchi. 
A) Deming. 
B) Shewhart. 
C) Juran. 
D) Taguchi.

Question 7

The Cp index equals the Cpk index if USL = 550, LSL = 540, μ = 546, and σ = 1.25.

Accepted Answer

A) True 
 B)False

Question 8

What does the second letter mean in the Six-Sigma DMAIC acronym?

Accepted Answer

A) Maximize 
B) Measure 
C) Mentor 
D) Mobilize 
A) Maximize 
B) Measure 
C) Mentor 
D) Mobilize

Question 9

Which statistician developed the 14 Points of Quality?

Accepted Answer

A) Juran 
B) Deming 
C) Taguchi 
D) Ishikawa 
A) Juran 
B) Deming 
C) Taguchi 
D) Ishikawa

Question 10

Control charts are used to monitor the quality of a product before it is produced.

Accepted Answer

A) True 
 B)False

Question 11

In statistical process control, the Cpk index measures the separate distances between the centerline μ and the USL and LSL.

Accepted Answer

A) True 
 B)False

Question 12

A control chart for the mean tells whether the product conforms to specifications.

Accepted Answer

A) True 
 B)False

Question 13

As a rule of thumb, if a process Cpk index is less than 1.00, the level of process capability is usually judged acceptable.

Accepted Answer

A) True 
 B)False

Question 14

Which is not a tool of statistical quality control?

Accepted Answer

A) Fishbone diagram 
B) Pareto chart 
C) Attribute control chart 
D) Deming chart 
A) Fishbone diagram 
B) Pareto chart 
C) Attribute control chart 
D) Deming chart

Question 15

Quality is ultimately best assessed by:

Accepted Answer

A) trained statisticians. 
B) quality control inspectors. 
C) management. 
D) customers. 
A) trained statisticians. 
B) quality control inspectors. 
C) management. 
D) customers.

Question 16

Which of the following is not a characteristic of Total Quality Management?

Accepted Answer

A) Employee empowerment 
B) Reduction of waste 
C) Continuous improvement 
D) Reducing the Cp index 
A) Employee empowerment 
B) Reduction of waste 
C) Continuous improvement 
D) Reducing the Cp index

Question 17

Find the Cpk index for a process with USL = 550, LSL = 540, μ = 544, and σ = 1.25.

Accepted Answer

A) 1.33 
B) 2.22 
C) 1.07 
D) 1.75 
A) 1.33 
B) 2.22 
C) 1.07 
D) 1.75

Question 18

Given the following control chart, which problem is most likely?

Accepted Answer

A) Instability 
B) Trend 
C) Level shift 
D) Cycle 
A) Instability 
B) Trend 
C) Level shift 
D) Cycle

Question 19

Which is not a characteristic of a p-chart?

Accepted Answer

A) It shows the number of defects per item being inspected. 
B) It measures the fraction of nonconforming items in a sample. 
C) It is based on the binomial distribution (or its normal approximation). 
D) It will have varying control limits if the sample size is changing. 
A) It shows the number of defects per item being inspected. 
B) It measures the fraction of nonconforming items in a sample. 
C) It is based on the binomial distribution (or its normal approximation). 
D) It will have varying control limits if the sample size is changing.

Question 20

Special cause variation exists when the process produces observations that are not from the same population as the majority of the observations.

Accepted Answer

A) True 
 B)False

A process may be in a state of control even if one sample mean is more than two standard deviations above the centerline.

In general terms, a capable process is one whose variability (σ) is small in relation to the distance between the centerline μ and the upper and lower specification limits.

In manufacturing, if workers readjust the equipment after each sample, it would typically:

Control charts (SPC charts) are attributed to:

The C_p index equals the C_pk index if USL = 550, LSL = 540, μ = 546, and σ = 1.25.

What does the second letter mean in the Six-Sigma DMAIC acronym?

Which statistician developed the 14 Points of Quality?

Control charts are used to monitor the quality of a product before it is produced.

In statistical process control, the C_pk index measures the separate distances between the centerline μ and the USL and LSL.

A control chart for the mean tells whether the product conforms to specifications.

As a rule of thumb, if a process C_pk index is less than 1.00, the level of process capability is usually judged acceptable.

Which is not a tool of statistical quality control?

Quality is ultimately best assessed by:

Which of the following is not a characteristic of Total Quality Management?

Find the C_pk index for a process with USL = 550, LSL = 540, μ = 544, and σ = 1.25.

Given the following control chart, which problem is most likely?

Which is not a characteristic of a p-chart?

Special cause variation exists when the process produces observations that are not from the same population as the majority of the observations.

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time Series Analysis

Chi-Square Tests

Nonparametric Tests

Filters

Exam 17: Quality Management

A process may be in a state of control even if one sample mean is more than two standard deviations above the centerline.

In general terms, a capable process is one whose variability (σ) is small in relation to the distance between the centerline μ and the upper and lower specification limits.

In manufacturing, if workers readjust the equipment after each sample, it would typically:

Control charts (SPC charts) are attributed to:

The Cp index equals the Cpk index if USL = 550, LSL = 540, μ = 546, and σ = 1.25.

What does the second letter mean in the Six-Sigma DMAIC acronym?

Which statistician developed the 14 Points of Quality?

Control charts are used to monitor the quality of a product before it is produced.

In statistical process control, the Cpk index measures the separate distances between the centerline μ and the USL and LSL.

A control chart for the mean tells whether the product conforms to specifications.

As a rule of thumb, if a process Cpk index is less than 1.00, the level of process capability is usually judged acceptable.

Which is not a tool of statistical quality control?

Quality is ultimately best assessed by:

Which of the following is not a characteristic of Total Quality Management?

Find the Cpk index for a process with USL = 550, LSL = 540, μ = 544, and σ = 1.25.

Given the following control chart, which problem is most likely?

Which is not a characteristic of a p-chart?

Special cause variation exists when the process produces observations that are not from the same population as the majority of the observations.

Overview of Statistics

Data Collection

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time Series Analysis

Chi-Square Tests

Nonparametric Tests

Filters

The C_p index equals the C_pk index if USL = 550, LSL = 540, μ = 546, and σ = 1.25.

In statistical process control, the C_pk index measures the separate distances between the centerline μ and the USL and LSL.

As a rule of thumb, if a process C_pk index is less than 1.00, the level of process capability is usually judged acceptable.

Find the C_pk index for a process with USL = 550, LSL = 540, μ = 544, and σ = 1.25.