OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
7th Edition
ISBN: 9780077835439
Author: Roger G Schroeder, M. Johnny Rungtusanatham, Susan Meyer Goldstein
Publisher: McGraw-Hill Education
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Question
Chapter 9, Problem 7P
a)
Summary Introduction
To determine: The upper and LCLs for X bar and R control charts.
b)
Summary Introduction
To determine: The action that should be taken.
c)
Summary Introduction
To discuss: The pros and cons of using a variable control chart instead of an attribute control chart.
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Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine
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To set up the machine and to create a control chart to be used throughout the run, 15 samples were
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as follows. Use three-sigma control limits.
SAMPLE
NUMBER
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7
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10
11
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978 1017
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A woodworker is concerned about the quality of the finished appearance of her work. She has finished a total of 50 unit split-willow hand-woven baskets. However, she has found the following number of finish defects in ten units sampled: 4,0,3,1,2,0,1,2,0,2.
Calculate the average number of defects per basket.
If 3-sigma control limits are used, calculate the lower control limit and upper control limit.
An e-commerce website has received some complaints on Billing errors. Managers ask the accounting department to monitor the
shipping process and make sure of the quality in their process. To monitor the process, for 10 consecutive weeks, they look into the
first 100 shipments and count the number of Billing errors as shown in table below:
45
52
6
3
63
7
8
9 10
1 6
1
2
Construct a two-sigma limit control chart to show whether the shipping process in this e-commerce firm needs any improvement or
performs at an acceptable level. (Round your answer to three decimal places.)
Week
1
2
3
Number of Billing errors.
5
1
3
Upper Control Limit
Lower Control Limit
Chapter 9 Solutions
OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
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