Question 1

____________________ variation is caused by a number of randomly occurring events that are part of the production process.

Accepted Answer

The answer of ____________________ variation is caused by a number...

Question 2

The centerline of an $\bar { x }$ control chart is the mean of the samples being collected.

Accepted Answer

A) True 
 B)False

Question 3

Discuss what we mean by chance variation in a process and give an example.

Accepted Answer

Chance variation is caused by a number o

Question 4

If the control limits of an $\bar { x }$ chart are set at $\pm$2 standard errors from the centerline instead of the commonly used $\pm$3 standard errors,this will result in

Accepted Answer

A)  an increased chance for a Type I error and a decreased chance for a Type II error. 
B)  an increased chance for a Type I error and an increased chance for a Type II error. 
C)  a decreased chance for a Type I error and an increased chance for a Type II error. 
D)  a decreased chance for a Type I error and a decreased chance for a Type II error. 
A)  an increased chance for a Type I error and a decreased chance for a Type II error. 
B)  an increased chance for a Type I error and an increased chance for a Type II error. 
C)  a decreased chance for a Type I error and an increased chance for a Type II error. 
D)  a decreased chance for a Type I error and a decreased chance for a Type II error.

Question 5

Control charts that are used to monitor a process whose results are categorized as either defective or nondefective are called:

Accepted Answer

A)  p chart 
B)  S chart 
C)  chart 
D)  None of these choices. 
A)  p chart 
B)  S chart 
C)  chart 
D)  None of these choices.

Question 6

When the $\bar { x }$ control chart shows a slow and steady shift (up or down)in the process distribution mean,the result is referred to as:

Accepted Answer

A)  a level shift. 
B)  a cycle. 
C)  a trend. 
D)  instability. 
A)  a level shift. 
B)  a cycle. 
C)  a trend. 
D)  instability.

Question 7

Variations in a process that are caused by a number of randomly occurring events that cannot be eliminated without changing the process are known as:

Accepted Answer

A)  assignable variation. 
B)  common variation. 
C)  special variation. 
D)  None of these choices. 
A)  assignable variation. 
B)  common variation. 
C)  special variation. 
D)  None of these choices.

Question 8

Describe what a Type II error is,and what its impact is,in terms of a production process.

Accepted Answer

A Type II error occurs when you conclude

Question 9

When the $\bar { x }$ control chart shows a repeated series of small observations followed by large observations,the result is referred to as:

Accepted Answer

A)  a cycle. 
B)  a trend. 
C)  a level shift. 
D)  instability. 
A)  a cycle. 
B)  a trend. 
C)  a level shift. 
D)  instability.

Question 10

Which of the following is an example of chance variation in a process?

Accepted Answer

A)  Two randomly selected boxes of cereal that don't weigh exactly 16 ounces (the labeled weight). 
B)  Two randomly selected boxes of cereal that don't weigh exactly the same. 
C)  Normal fluctuations in the process that randomly occur. 
D)  None of these choices. 
A)  Two randomly selected boxes of cereal that don't weigh exactly 16 ounces (the labeled weight). 
B)  Two randomly selected boxes of cereal that don't weigh exactly the same. 
C)  Normal fluctuations in the process that randomly occur. 
D)  None of these choices.

Question 11

Diaper Delivery
Wrap-M-Up,a Ft.Lauderdale diaper Service,has 10 delivery men who each deliver diapers to 50 customers every day.Wrap-M-Up decides to record the proportion of diapers delivered on time for a 10-day period and construct a p chart to see whether the proportion is too erratic.The data are shown below:
 $$\begin{array} { | l | c c c c c c c c c c | } 
\hline \text { Day } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \
\hline \text { Prapartion of Dingers } & .916 & .894 & .928 & .900 & .864 & .968 & .914 & .988 & .952 & .936 \
\text { Delivered an Time } & & & & & & & & & & \
\hline
\end{array}$$
-{Diaper Delivery Narrative} Find the numerical value of the center line for the p chart.

Accepted Answer

The answer of Diaper Delivery
Wrap-M-Up,a Ft.Lauderdale diaper Service,has 10 delivery...

Question 12

Samples Production
Thirty samples of size 4 were drawn from a production process.The data are shown below.
  
-{30 Samples Production Narrative} Construct an S chart.

Accepted Answer

CL = 4.452

Question 13

The lower and upper control limits of an $\bar { x }$ control chart are usually set at:

Accepted Answer

A)  $\pm$ one standard error from the centerline. 
B) $\pm$ two standard errors from the centerline. 
C)  $\pm$ three standard errors from the centerline. 
D)  None of these choices. 
A)  $\pm$ one standard error from the centerline. 
B) $\pm$ two standard errors from the centerline. 
C)  $\pm$ three standard errors from the centerline. 
D)  None of these choices.

Question 14

A coffee machine fills cups with an average of 6 ounces with a standard deviation of .25 ounces.A sample of 9 cups is taken.The lower and upper control limits for a 3-sigma $\bar { x }$ control chart are 5.75 and 6.25,respectively.

Accepted Answer

A) True 
 B)False

Question 15

If the average run length of a process is 385,that means the sample size should be 385 for each sample collected.

Accepted Answer

A) True 
 B)False

Question 16

Samples Manufacturing
The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are $\bar { x } = 518.7$ ,and S = 11.5,respectively.
-{40 Samples Manufacturing Narrative} Compute the zone boundaries for the $\bar { x }$ chart.

Accepted Answer

The answer of Samples Manufacturing
The mean of the sample means...

Question 17

Samples Manufacturing
The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are $\bar { x } = 518.7$ ,and S = 11.5,respectively.
-{40 Samples Manufacturing Narrative} Calculate the centerline and control limits for the $\bar { x }$ chart.

Accepted Answer

The answer of Samples Manufacturing
The mean of the sample means...

Question 18

When the purpose of sampling is to detect when a process becomes too variable,the chart of choice will be a p chart.

Accepted Answer

A) True 
 B)False

Question 19

If a machine part is slowly losing its ability to work,causing the standard deviation of the process to increase,this is an example of assignable variation called a trend.

Accepted Answer

A) True 
 B)False

Question 20

The mean of the sample means and the pooled standard deviation of 36 samples of size 9 taken from a production process under control are $\bar{\bar { x } }= 150$ ,and S = 6,respectively.The lower control limit of the 3-sigma $\bar { x }$ chart is 147.

Accepted Answer

A) True 
 B)False

Exam 21: Statistical Process Control

____________________ variation is caused by a number of randomly occurring events that are part of the production process.

The centerline of an xˉ\bar { x }xˉ control chart is the mean of the samples being collected.

Discuss what we mean by chance variation in a process and give an example.

If the control limits of an xˉ\bar { x }xˉ chart are set at ±\pm± 2 standard errors from the centerline instead of the commonly used ±\pm± 3 standard errors,this will result in

Control charts that are used to monitor a process whose results are categorized as either defective or nondefective are called:

When the xˉ\bar { x }xˉ control chart shows a slow and steady shift (up or down)in the process distribution mean,the result is referred to as:

Variations in a process that are caused by a number of randomly occurring events that cannot be eliminated without changing the process are known as:

Describe what a Type II error is,and what its impact is,in terms of a production process.

When the xˉ\bar { x }xˉ control chart shows a repeated series of small observations followed by large observations,the result is referred to as:

Which of the following is an example of chance variation in a process?

Samples Production Thirty samples of size 4 were drawn from a production process.The data are shown below. -{30 Samples Production Narrative} Construct an S chart.

The lower and upper control limits of an xˉ\bar { x }xˉ control chart are usually set at:

A coffee machine fills cups with an average of 6 ounces with a standard deviation of .25 ounces.A sample of 9 cups is taken.The lower and upper control limits for a 3-sigma xˉ\bar { x }xˉ control chart are 5.75 and 6.25,respectively.

If the average run length of a process is 385,that means the sample size should be 385 for each sample collected.

When the purpose of sampling is to detect when a process becomes too variable,the chart of choice will be a p chart.

If a machine part is slowly losing its ability to work,causing the standard deviation of the process to increase,this is an example of assignable variation called a trend.

The mean of the sample means and the pooled standard deviation of 36 samples of size 9 taken from a production process under control are xˉˉ=150\bar{\bar { x } }= 150xˉˉ=150 ,and S = 6,respectively.The lower control limit of the 3-sigma xˉ\bar { x }xˉ chart is 147.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

A: Numerical Descriptive Techniques

B: Numerical Descriptive Techniques

C: Numerical Descriptive Techniques

Data Collection and Sampling

Probability

A: Random Variables and Discrete Probability Distributions

B: Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

A: Simple Linear Regression and Correlation

B: Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analysis and Forecasting

Decision Analysis

Conclusion

Filters

The centerline of an $\bar { x }$ control chart is the mean of the samples being collected.

If the control limits of an $\bar { x }$ chart are set at $\pm$ 2 standard errors from the centerline instead of the commonly used $\pm$ 3 standard errors,this will result in

When the $\bar { x }$ control chart shows a slow and steady shift (up or down)in the process distribution mean,the result is referred to as:

When the $\bar { x }$ control chart shows a repeated series of small observations followed by large observations,the result is referred to as:

The lower and upper control limits of an $\bar { x }$ control chart are usually set at:

A coffee machine fills cups with an average of 6 ounces with a standard deviation of .25 ounces.A sample of 9 cups is taken.The lower and upper control limits for a 3-sigma $\bar { x }$ control chart are 5.75 and 6.25,respectively.

The mean of the sample means and the pooled standard deviation of 36 samples of size 9 taken from a production process under control are $\bar{\bar { x } }= 150$ ,and S = 6,respectively.The lower control limit of the 3-sigma $\bar { x }$ chart is 147.