Question 1

True or False: Larger Cpk indicates larger capability of meeting the requirements.

Accepted Answer

A) True 
 B)False

Question 2

________ causes of variation are correctable without modifying the system.

Accepted Answer

The answer of ________ causes of variation are correctable without...

Question 3

True or False: Cp > 1 indicates that if the process average can be centered,then more than 99.73% of the observations will fall inside the specification limits.

Accepted Answer

A) True 
 B)False

Question 4

TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds)is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.   She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-True or False: Changes in the system to reduce common cause variation are the responsibility of management.

Accepted Answer

A) True 
 B)False

Question 5

The principal focus of the control chart is the attempt to separate special or assignable causes of variation from common causes of variation.Which causes of variation can be reduced only by changing the system?

Accepted Answer

A) Special or assignable causes 
B) Common causes 
C) Total causes 
D) None of the above 
A) Special or assignable causes 
B) Common causes 
C) Total causes 
D) None of the above

Question 6

Which of the following is not one of Deming's 14 points?

Accepted Answer

A) Belief in mass inspection. 
B) Create constancy of purpose for improvement of product or service. 
C) Adopt and institute leadership. 
D) Drive out fear. 
A) Belief in mass inspection. 
B) Create constancy of purpose for improvement of product or service. 
C) Adopt and institute leadership. 
D) Drive out fear.

Question 7

TABLE 18-7
A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process.She takes sample sizes of 5 from each day's output and counts the number of blemishes on each silicone sheet.The results from 20 days of such evaluations are presented below.
Sheet
Day 1 2 3 4 5 Mean Range
1 8 10 14 6 5 8.6 9
2 8 13 6 6 10 8.6 7
3 10 12 7 7 9 9.0 5
4 5 9 12 7 10 8.6 7
5 8 3 8 9 10 7.6 7
6 9 7 9 6 9 8.0 3
7 10 10 5 7 6 7.6 5
8 10 9 10 6 5 8.0 5
9 6 10 6 9 9 8.0 4
10 6 9 8 6 8 7.4 3
11 8 5 6 10 10 7.8 5
12 6 4 7 7 12 7.2 8
13 7 5 7 6 9 6.8 4
14 5 8 8 7 6 6.8 3
15 7 12 10 6 10 9.0 6
16 7 11 4 7 8 7.4 7
17 8 4 5 4 7 5.6 4
18 11 4 11 11 10 9.4 7
19 6 10 6 10 10 8.4 4
20 6 12 12 6 8 8.8 6
She also decides that the upper specification limit is 10 blemishes.
-Referring to Table 18-7,an   chart is to be used for the number of blemishes.The lower control limit for this data set is ________,while the upper control limit is ________.

Accepted Answer

The answer of TABLE 18-7
A supplier of silicone sheets for...

Question 8

The control chart

Accepted Answer

A) focuses on the time dimension of a system. 
B) captures the natural variability in the system. 
C) can be used for categorical,discrete,or continuous variables. 
D) All of the above. 
A) focuses on the time dimension of a system. 
B) captures the natural variability in the system. 
C) can be used for categorical,discrete,or continuous variables. 
D) All of the above.

Question 9

Once the control limits are set for a control chart,one attempts to

Accepted Answer

A) discern patterns that might exist in values over time. 
B) determine whether any points fall outside the control limits. 
C) Both of the above. 
D) None of the above. 
A) discern patterns that might exist in values over time. 
B) determine whether any points fall outside the control limits. 
C) Both of the above. 
D) None of the above.

Question 10

TABLE 18-10
Below is the number of defective items from a production line over twenty consecutive morning shifts.  
-True or False: Referring to Table 18-10,based on the c chart,no opportunity appears to be present to render an improvement in the process.

Accepted Answer

A) True 
 B)False

Question 11

TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds)is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.   She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Table 18-4,what is the value of d2 factor?

Accepted Answer

Question 12

TABLE 18-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly,the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.  
-Referring to Table 18-3,suppose the analyst constructs an   chart to see if the production process is in-control.What is the center line for this chart?

Accepted Answer

A) 64.3 
B) 59.5 
C) 58.0 
D) 57.1 
A) 64.3 
B) 59.5 
C) 58.0 
D) 57.1

Question 13

TABLE 18-2
A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent.The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic.  
-Referring to Table 18-2,which expression best characterizes the p chart?

Accepted Answer

A) In-control 
B) Increasing trend 
C) Decreasing trend 
D) Individual outliers 
A) In-control 
B) Increasing trend 
C) Decreasing trend 
D) Individual outliers

Question 14

True or False: The Cp index measures the potential of a process,not its actual performance.

Accepted Answer

A) True 
 B)False

Question 15

TABLE 18-10
Below is the number of defective items from a production line over twenty consecutive morning shifts.  
-True or False: Referring to Table 18-10,based on the c chart,it appears that the process is out of control.

Accepted Answer

A) True 
 B)False

Question 16

TABLE 18-6
The maker of a packaged candy wants to evaluate the quality of her production process.On each of 16 consecutive days,she samples 600 bags of candy and determines the number in each day's sample that she considers to be of poor quality.The data that she developed follow.  
-Referring to Table 18-6,construct a p control chart for these data.

Accepted Answer

P Chart: S

Question 17

TABLE 18-4
A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds)is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below.   She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively.
-Referring to Table 18-4,what percentage of the time it takes workers to complete an important production task will fall inside the specification limits?

Accepted Answer

The answer of TABLE 18-4
A factory supervisor is concerned that...

Question 18

TABLE 18-1
A local newspaper has 10 delivery boys who each deliver the morning paper to 50 customers every day.The owner decides to record the number of papers delivered on time for a 10-day period for one of the delivery boys and construct a p chart to see whether the percentage is too erratic.  
-Referring to Table 18-1,what is the numerical value of the center line for the p chart?

Accepted Answer

A) 0.926 
B) 0.911 
C) 0.885 
D) 0.500 
A) 0.926 
B) 0.911 
C) 0.885 
D) 0.500

Question 19

TABLE 18-8
Recently,a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time students are spending on the computer registering under the new system.She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering.The range,mean,and standard deviation of the times required to register are in the table that follows.  
-Referring to Table 18-8,construct an R chart for the time required to register.

Accepted Answer

The answer of TABLE 18-8
Recently,a university switched to a new...

Question 20

TABLE 18-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly,the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.  
-Referring to Table 18-3,suppose the analyst constructs an   chart to see if the production process is in-control.Which expression best describes this chart?

Accepted Answer

A) In-control 
B) Increasing trend 
C) Decreasing trend 
D) Individual outliers 
A) In-control 
B) Increasing trend 
C) Decreasing trend 
D) Individual outliers

Exam 18: Statistical Applications in Quality Management

True or False: Larger Cpk indicates larger capability of meeting the requirements.

________ causes of variation are correctable without modifying the system.

True or False: Cp > 1 indicates that if the process average can be centered,then more than 99.73% of the observations will fall inside the specification limits.

The principal focus of the control chart is the attempt to separate special or assignable causes of variation from common causes of variation.Which causes of variation can be reduced only by changing the system?

Which of the following is not one of Deming's 14 points?

The control chart

Once the control limits are set for a control chart,one attempts to

TABLE 18-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -True or False: Referring to Table 18-10,based on the c chart,no opportunity appears to be present to render an improvement in the process.

True or False: The Cp index measures the potential of a process,not its actual performance.

TABLE 18-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -True or False: Referring to Table 18-10,based on the c chart,it appears that the process is out of control.

Defining and Collecting Data

Numerical Descriptive Measures

Basic Probability

Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Sampling Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Forecasting

A Roadmap for Analyzing Data

Decision Making

Index Numbers

Chi-Square Tests for the Variance or Standard Deviation

Mcnemar Test for the Difference Between Two Proportions Related Samples

The Analysis of Means Anom

The Analysis of Proportions Anop

The Randomized Block Design

The Power of a Test

Estimation and Sample Size Determination for Finite Populations

Application of Confidence Interval Estimation in Auditing

Sampling From Finite Populations

The Normal Approximation to the Binomial Distribution

Counting Rules

Lets Get Started Big Things to Learn First

Filters

True or False: Larger C_pk indicates larger capability of meeting the requirements.

True or False: C_p > 1 indicates that if the process average can be centered,then more than 99.73% of the observations will fall inside the specification limits.

True or False: The C_p index measures the potential of a process,not its actual performance.