Question 1

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 2

Assume a process has limits set at ±2.5 standard errors from the centerline.The average run length (ARL)is 81.What does this mean?

Accepted Answer

When the process is under control,the @#IMG-DLM& c

Question 3

In designing a control chart,the statistician must select a sample size and a sampling frequency.These decisions are based on which factors:

Accepted Answer

A) Cost of making Type I and Type II errors. 
B) Length of the production run. 
C) Typical change in the process distribution when the process goes out of control. 
D) All of these choices are true. 
A) Cost of making Type I and Type II errors. 
B) Length of the production run. 
C) Typical change in the process distribution when the process goes out of control. 
D) All of these choices are true.

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A Type I error occurs when you conclude

Question 6

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

Accepted Answer

Assignable variation is caused by specif

Question 7

25 Samples Production 
25 samples of size 4 were taken from a manufacturing process.The mean of the sample means and the pooled standard deviation are   ,and S = 3.5,respectively.The sample means are listed below.   ​ ​
-{25 Samples Production Narrative} Is the process under control? Discuss.

Accepted Answer

The process is out o

Question 8

To construct a   chart,estimate the mean of the process distribution using the mean of the sample means,denoted by: ____________________.

Accepted Answer

The answer of To construct a   chart,estimate the...

Question 9

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:   ​ ​
-{Diaper Delivery Narrative} Find the numerical value of the upper control limit for the p chart.

Accepted Answer

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

Question 10

Chance variation was built into the produce when the production process was first set up.

Accepted Answer

A) True 
 B)False

Question 11

If a p chart finds fourteen sample proportions in a row that alternate up and down,this could be an example of assignable cause variation called a(n)____________________.

Accepted Answer

The answer of If a p chart finds fourteen sample...

Question 12

How do we know when a process is in control?

Accepted Answer

A) The   control chart shows sample means that are randomly distributed between the control limits. 
B) Each observation sampled is drawn from an identical distribution. 
C) The   control chart shows no patterns or cycles in the plotted sample means. 
D) All of these choices are true. 
A) The   control chart shows sample means that are randomly distributed between the control limits. 
B) Each observation sampled is drawn from an identical distribution. 
C) The   control chart shows no patterns or cycles in the plotted sample means. 
D) All of these choices are true.

Question 13

Sample proportions that are ____________________ than the lower control limit of a p chart indicate a change in the process that we would like to keep.

Accepted Answer

The answer of Sample proportions that are ____________________ than the...

Question 14

Suppose you are producing a product implementing statistical process control.
​
a.Give an example of assignable variation that would create a level shift.
b.Give an example of assignable variation that would create instability.
c.Give an example of assignable variation that would create a trend.
d.Give an example of assignable variation that would create a cycle.

Accepted Answer

a. Machine breakdown,new machine and/or

Question 15

A new machine can cause a change in the mean of a process distribution.This is a result of a level shift.

Accepted Answer

A) True 
 B)False

Question 16

If a control chart finds the standard deviation in the means is increasing,this could be an indicator of assignable variation called ____________________.

Accepted Answer

The answer of If a control chart finds the standard...

Question 17

If a control chart finds fourteen points in a row that are alternating up and down,this is an example of assignable variation called a(n)____________________.

Accepted Answer

The answer of If a control chart finds fourteen points...

Question 18

For an   chart,the lower and upper control limits are usually set at three standard errors from the centerline.

Accepted Answer

A) True 
 B)False

Question 19

If the lower control limit for the p chart is negative,we set it equal to

Accepted Answer

A) 2 
B) 1 
C) 0 
D) None of these choices. 
A) 2 
B) 1 
C) 0 
D) None of these choices.

Question 20

To determine whether the proportion of defectives is in line with specifications,we use a(n):

Accepted Answer

A)    chart. 
B) S chart. 
C) p chart. 
D) All of these choices are true. 
A)    chart. 
B) S chart. 
C) p chart. 
D) All of these choices are true.

Exam 21: Statistical Process Control

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

Assume a process has limits set at ±2.5 standard errors from the centerline.The average run length (ARL)is 81.What does this mean?

In designing a control chart,the statistician must select a sample size and a sampling frequency.These decisions are based on which factors:

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

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

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

25 Samples Production 25 samples of size 4 were taken from a manufacturing process.The mean of the sample means and the pooled standard deviation are ,and S = 3.5,respectively.The sample means are listed below. ​ ​ -{25 Samples Production Narrative} Is the process under control? Discuss.

To construct a chart,estimate the mean of the process distribution using the mean of the sample means,denoted by: ____________________.

Chance variation was built into the produce when the production process was first set up.

If a p chart finds fourteen sample proportions in a row that alternate up and down,this could be an example of assignable cause variation called a(n)____________________.

How do we know when a process is in control?

Sample proportions that are ____________________ than the lower control limit of a p chart indicate a change in the process that we would like to keep.

A new machine can cause a change in the mean of a process distribution.This is a result of a level shift.

If a control chart finds the standard deviation in the means is increasing,this could be an indicator of assignable variation called ____________________.

If a control chart finds fourteen points in a row that are alternating up and down,this is an example of assignable variation called a(n)____________________.

For an chart,the lower and upper control limits are usually set at three standard errors from the centerline.

If the lower control limit for the p chart is negative,we set it equal to

To determine whether the proportion of defectives is in line with specifications,we use a(n):

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

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

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Decision Analysis

Conclusion

Filters

25 Samples Production 25 samples of size 4 were taken from a manufacturing process.The mean of the sample means and the pooled standard deviation are ,and S = 3.5,respectively.The sample means are listed below. -{25 Samples Production Narrative} Is the process under control? Discuss.