OPERATIONS MANAGEMENT CUSTOM ACCESS
11th Edition
ISBN: 9780135622438
Author: KRAJEWSKI
Publisher: PEARSON EDUCATION (COLLEGE)
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Question
Chapter 3, Problem 27P
(a)
Summary Introduction
Interpretation: It is to be determined that the call center access time is in statistical control.
Concept Introduction:
The X-chart is used to determine the central tendency of the process. By using the X-chart it easy to determine the abnormalities of the process along with the errors which are responsible for these errors.
(b)
Summary Introduction
Interpretation: The capability of the process is to be determined when three-sigma performance is desired.
Concept Introduction:
The X-chart is used to determine the central tendency of the process. By using the X-chart it easy to determine the abnormalities of the process along with the errors which are responsible for these errors.
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Southern Mills Company
One of the stages in the process of making denim cloth at the Southern Mills Company is to spin
cotton yarn onto spindles for subsequent use in the weaving process. Occasionally the yarn breaks
during the spinning process, and an operator ties it back together. Some number of breaks is
considered normal; however, too many breaks may mean that the yarn is of poor quality. In order to
monitor this process, the quality-control manager randomly selects a spinning machine each hour
and checks the number of breaks during a 15-minute period. Following is a summary of the
observations for the past 20 hours.
Construct a c-chart using 3 limits for this process and indicate if the process was out of control at
any time.
Number of
Number of
Sample
Breaks
Sample
Breaks
1
3
11
2
12
4
3
4
13
6
1
14
7
5
5
15
8
6
3
16
6
7
2
17
5
8
4
18
7
19
8
10
2
20
6
While analyzing their annual sales data (liters of wine sold per year) for the past 30
years, a vineyard found that after taking four successive differences, the resulting data had a
mean of 2458 liters and looked like a stationary process (e.g. white noise). If the actual data for
the past four years were 2018 - 2134 liters, 2017 - 2403 liters, 2016 - 2076 liters, and 2015 - 2290
liters. What would be a reasonable forecast for sales in 2019? Explain.
The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the averageproportion of correct responses has been 72 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The numbers of correct answers were 18, 16, 19, 21, 20, 16,21, 16, 17, 10, 25, 18, 25, 16, 20, 15, 23, 19, 21, and 19. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z = 3. b. Is the tax information process in statistical control?
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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