Managing Quality: Integrating the Supply Chain, 6e (Foster)
Chapter 12 Statistically Based Quality Improvement for Attributes
1) ________ attributes relate to whether or not a particular product or service performs as it is
supposed to.
A) Structural
B) Sensory
C) Performance
D) Temporal
E) Ethical
2) ________ attributes relate to senses of touch, smell, taste, and sound.
A) Structural
B) Sensory
C) Performance
D) Consensual
E) Ethical
3) ________ attributes relate to time.
A) Structural
B) Sensory
C) Performance
D) Temporal
E) Tactile
4) ________ attributes answer whether a service provider is empathetic or if their accounting
systems report properly.
A) Structural
B) Sensory
C) Performance
D) Temporal
E) Ethical
5) ________ attributes relate to the physical characteristics of a particular product or service.
A) Structural
B) Sensory
C) Performance
D) Temporal
E) Ethical
6) Attributes that are more internal and engineering-oriented are called ________ attributes.
A) structural
B) sensory
C) performance
D) customer-based
E) production-related
7) A painter paints a wall and when too much paint is applied, drips result. In the language of
attribute charts, the drips are ________.
A) defectives
B) defects
C) variables
D) critical
E) temporal
8) Structural attributes have to do with physical characteristics of a particular product or service.
9) Sensory attributes relate to whether or not a particular product or service performs as it is
supposed to.
10) Customer-based attributes are internal and engineering-oriented.
11) An attribute is a continuous measurement such as weight, height, or volume.
12) The atmosphere and other aspects of a customer’s experience in a hotel would be examples of
sensory attributes.
13) Attribute charts are developed and interpreted the same way as variables charts.
14) Production-related attributes are more important to quality managers than customer-based
attributes.
15) State the five types of attributes.
16) The first step in developing an attribute process chart is to ________.
A) determine whether the critical product characteristic is a variable or an attribute
B) establish control limits
C) identify critical product characteristics
D) identify critical operations where process inspection might be needed
E) select the appropriate process chart from the many types of charts
17) A quality engineer notes that a process produces data that are binomial and has been obtained
using a sample space that is not constant. The primary interest of the process manager is in the
number of discrepancies per part. An appropriate control chart to use would be a(n) ________.
A) np chart
B) p chart
C) c chart
D) u chart
E) d chart
18) A quality engineer notes that a process produces data that are binomial and has been obtained
using a sample space that is not constant. The primary interest of the process manager is in the
percentage of bad parts. An appropriate control chart to use would be a(n) ________.
A) np chart
B) p chart
C) c chart
D) u chart
E) d chart
19) A quality engineer notes that a process produces data that are binomial and has been obtained
using a sample space that is constant. The primary interest of the process manager is in the
percentage of bad parts. An appropriate control chart to use would be a(n) ________.
A) p chart
B) r chart
C) c chart
D) u chart
E) d chart
20) A painting contractor wishes to compare the work done by several painters in several rooms
of varying sizes. If the contractor is concerned about drips and missed spots, an np chart would
be the logical choice.
21) A winemaker tastes several 750 ml bottles of varying vintages. A good choice for such a test
would be a c chart.
22) Determining whether a critical product characteristic is a variable or attribute is one of the
steps in developing a process chart.
23) What are the steps required to develop an attribute control chart?
24) Describe the differences between a defect and a defective. Provide an example of each and
identify the types of process charts that would monitor defects and defectives.
25) What are attribute charts used for and how do they work?
26) An insurance claims department employs 10 claims adjusters who spend all day verifying
that forms are valid and have been completed correctly. Forms with mistakes are useless and
must be returned to the adjuster who must contact the customer again and resubmit the claim.
The supervisor reviews two claims processed by each employee to verify that the process is
working at acceptable levels.
How should the process be monitored? Explain your reasoning.
27) An irregularity or problem with a larger unit is a(n) ________.
A) defect
B) defective
C) flaw
D) mistake
E) error
28) A unit that, as a whole, is not acceptable or does not meet performance requirements is a(n)
________.
A) defect
B) defective
C) flaw
D) mistake
E) error
29) Which of the following is an example of a statistic based on an attribute?
A) s (standard deviation)
B) R (range)
C) p (proportion defective)
D) MR (moving range)
E) X bar (process population average)
30) Which of the following is not used for monitoring defects or defectives?
A) p charts
B) np charts
C) u charts
D) c charts
E) r charts
31) Defectives are monitored using ________.
A) c charts
B) g charts
C) u charts
D) p charts
E) d charts
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Scratched
3
2
0
1
2
2
1
0
1
2
32) A producer of contact lenses regularly takes samples of 100 lenses and inspects them for
scratches. If a lens has a single scratch, it cannot be sold. The results of 10 samples are shown.
What is the average proportion defective?
A) 0.012
B) 0.014
C) 0.020
D) 0.028
E) 0.035
33) A producer of contact lenses regularly takes samples of 100 lenses and inspects them for
scratches. If a lens has a single scratch, it cannot be sold. The results of 10 samples are shown.
What sample is out of control?
A) 2
B) 4
C) 6
D) 8
E) none of the above
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Discarded
2
13
10
10
5
8
7
6
6
5
34) A manufacturer of FAX machines checks samples of 50 units for functionality at the
conclusion of the assembly process. The results of 10 samples are shown.
What is the average proportion defective?
A) 0.07
B) 0.14
C) 0.21
D) 0.28
E) 0.35
35) A manufacturer of FAX machines checks samples of 50 units for functionality at the
conclusion of the assembly process. The results of 10 samples are shown below:
Sample #
1
2
3
4
5
6
7
8
9
10
# Discarded
1
16
9
9
4
8
7
7
6
5
What sample is out of control?
A) 1
B) 2
C) 3
D) 4
E) none of the above
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Bad Hoods
9
11
15
0
7
9
3
9
8
16
36) The producers of the Yugo automobile periodically inspect samples of 80 hoods for dents
and scratches. A single flaw in a hood renders it unsuitable for installation in one of their fine
automobiles. The results of the last 10 samples are shown.
Calculate the standard error, snp, for the np chart.
A) 7.75
B) 0.10
C) 0.31
D) 2.78
E) 2.95
37) The producers of the Yugo automobile periodically inspect samples of 80 hoods for dents
and scratches. A single flaw in a hood renders it unsuitable for installation in one of their fine
automobiles. The results of the last 10 samples are shown.
What sample is out of control?
A) 1
B) 3
C) 5
D) 4
E) 10
Use the following table to answer the question(s) below.
Bench #
1
2
3
4
5
6
7
8
9
10
# Drips
9
10
3
4
4
11
14
13
11
13
38) A parks and recreation worker counts the number of paint drips on each standard size park
bench. The results from the last 10 benches are shown.
If the Parks Department decides to make a c chart, what bench number is out of control?
A) 1
B) 3
C) 5
D) 7
E) none of the above
39) A defect is an irregularity or problem with a larger unit.
40) A p chart can be used whether or not there is a constant sample size.
41) An np chart can be used whether or not the sample sizes are the same.
42) The p chart is a process chart that is used to graph the proportion of items in a sample that
are defective.
43) The np chart is a graph of the number of defectives in a subgroup.
44) The u chart is a graph of the number of defects per unit.
45) The lower control limit for a p chart cannot be lower than zero.
46) The shape of the process line in a p chart and an np chart plot is always identical if the same
data are used.
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Scratched
3
2
0
1
2
2
1
0
1
2
47) A producer of contact lenses regularly takes samples of 100 lenses and inspects them for
scratches. If a lens has a single scratch, it cannot be sold. The results of 10 samples are shown.
What are the lower and upper 3-sigma control limits?
A) (-0.021, 0.012)
B) (-0.021, 0.000)
C) (0.012, 0.035)
D) (0.000, 0.035)
E) (0.000, 0.049)
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Discarded
2
13
10
10
5
8
7
6
6
5
48) A manufacturer of FAX machines checks samples of 50 units for functionality at the
conclusion of the assembly process. The results of 10 samples are shown.
What are the lower and upper 3-sigma control limits?
A) (-0.01, 0.09)
B) (-0.01, 0.00)
C) (-0.01, 0.29)
D) (0.00, 0.09)
E) (0.00, 0.29)
Use the following table to answer the question(s) below.
Sample #
1
2
3
4
5
6
7
8
9
10
# Bad Hoods
9
11
15
0
7
9
3
9
8
16
49) The producers of the Yugo automobile periodically inspect samples of 80 hoods for dents
and scratches. A single flaw in a hood renders it unsuitable for installation in one of their fine
automobiles. The results of the last 10 samples are shown..
What is the center line for the np chart?
A) 2.4
B) 5.8
C) 7.2
D) 8.7
E) 10.1
50) The producers of the Yugo automobile periodically inspect samples of 80 hoods for dents
and scratches. A single flaw in a hood renders it unsuitable for installation in one of their fine
automobiles. The results of the last 10 samples are shown..
What are the lower and upper control limits for the np chart?
A) (-8.35, 2.8)
B) (2.8, 8.35)
C) (0.3, 17.1)
D) (8.7, 17.1)
E) (0.4, 8.7)