OPERATIONS MANAGEMENT CUSTOM ACCESS
11th Edition
ISBN: 9780135622438
Author: KRAJEWSKI
Publisher: PEARSON EDUCATION (COLLEGE)
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Question
Chapter 3, Problem 19P
(a)
Summary Introduction
Interpretation:The c-chart is to be constructed.
Concept Introduction:
The representation of defects in a constant sample size is done by the c-chart. This is basically used at that the time when the identification of actual number of defects is difficult.
(b)
Summary Introduction
Interpretation: It is to be concluded when the next five samples have 15, 18, 12, 22, 22 irregularities.
Concept Introduction:
The representation of defects in a constant sample size is done by the c-chart. This is basically used at that the time when the identification of actual number of defects is difficult.
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Auto pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor
that must be controlled. From sample sizes of 5 pistons produced each day, the mean and the range of this diameter have
been as follows:
Day
Mean (mm)
Range R (mm)
158
4.3
151.2
4.4
155.7
4.2
153.5
4.8
156.6
4.5
What is the UCL using 3-sigma?(round your response to two decimal places).
1.
2.
4.
A garment manufacturer wants to set up a control chart for irregularities. Each
week a random sample of 25 garments is collected from production and the
number of irregularities is recorded. The table below gives the results for the past
20 weeks:
1
6
8
10
Sample
Number
Irregularities 11
2
3
4
5
7
9
8
12
4
16
5
8
17
10
11
16
20
Sample
Number
| Irregularities 11
12
13
14
15
17
18
19
7
12
13
8
17
11
9
10
(a) Using the data set up an appropriate control chart using a three sigma
control limits.
(b) Comment on the process.
[8 marks]
[2 marks]
9,
6 of 11
5
3. The manager of a building-supplies company randomly samples incoming lumber to see whether
it meets quality specifications. From each shipment, 100 pieces of 2 x 4 lumber are inspected and
judged according to whether they are first (acceptable) or second (defective) grade. The
proportions of second-grade 2 x 4s recorded for 30 shipments were as follows:
a. Construct a control chart for the proportion of second-grade 2 x 4s in samples of 100 pieces of
lumber.
b. Explain how the control chart can be of use to the manager of the building supplies company.
Shipment
No.
Proportion
of second
grade
1
0.14
2
0.22
3
0.21
4
0.15
0.19
0.26
7
0.18
8
0.22
9
0.23
10
0.21
11
0.2
12
0.14
13
0.25
14
0.2
15
0.19
16
0.18
17
0.22
18
0.22
19
0.17
20
0.21
21
0.21
22
0.13
23
0.15
24
0.2
25
0.23
26
0.23
27
0.12
28
0.19
29
0.19
30
0.26
Chapter 3 Solutions
OPERATIONS MANAGEMENT CUSTOM ACCESS
Ch. 3 - Should a very pricey handcrafted object of beauty...Ch. 3 - Prob. 2DQCh. 3 - Prob. 3DQCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7P
Ch. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 31PCh. 3 - Prob. 1AMECh. 3 - Prob. 2AMECh. 3 - Prob. 3AMECh. 3 - Prob. 4AMECh. 3 - Prob. 5AMECh. 3 - Prob. 1VCCh. 3 - Prob. 2VC
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