Principles Of Operations Management
11th Edition
ISBN: 9780135173930
Author: RENDER, Barry, HEIZER, Jay, Munson, Chuck
Publisher: Pearson,
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Question
Chapter 10, Problem 27P
Summary Introduction
To determine: The number of observations required.
Introduction: Thesample size is required to determine the number of observations that are necessary to find the true cycle time.
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stion
In a fabric manufacturing factory, the quality control process using control charts from SPC. In an hour there are a total of 5 samples are taken
each having 5 observations regarding the thickness of fabric in measured in millimeters. In a particular hour, the sample means (X-bar) are noted to
be: 156.46, 199.62, 189.31, 102.22, and112.09 respectively. In the same sample, the corresponding ranges are: 11.97, 12.17, 13.94, 11.86, and
11.83 respectively. What are the lower and upper control limits for the X-bar chart?
et
ered
ed out of
O a.
None is correct
lag
O b.
156.55, 170.47
tion
O C.
144.77, 159.11
O d. 145.40, 190.72
O e. 143.55, 165.47
Of.
142.92, 160.66
Fi
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Question :
A process that is considered to be in control measures an ingredient in ounces. Below are the last ten samples (each of size n=5) taken. The population standard deviation is 1.36.
SAMPLE
1
2
3
4
5
6
7
8
9
10
5
6
9
10
9
10
9
12
8
9
8
9
9
8
12
11
9
9
6
10
6
8
5
7
10
8
10
9
4
12
4
7
3
8
8
6
12
10
4
11
5
4
2
9
8
6
8
6
5
7
Using information from the above table:
Calculate the standard deviation of the sample means, σ×.
Determine the control limits for the mean chart, using A2 and σ× if z=3.
Determine the control limits for the range chart.
Construct mean (using A2) and range control charts by using information from (ii) and (iii).
Comment on your results.
Question 3
A coffee producer wishes to produce new 50-gram pack for people who like
to bring their own coffee when they travel. The producer asked your help to
monitor the quality of the process by setting up the appropriate control charts.
Based on the data shown in the table, is the process in control?
Sample
2
3
4
5
6
7
8
9
2
3
4
Values for A2, D3 and D4
Sample Size n
10
1
54.5
50.6
51.1
52.7
51.7
5
6
7
8
9
10
11
51.1
54.0
53.2
51.9
A2 D3
1.88
0
1.02
0
0.73 0
0.58 0
0.48
0
0.42 0.08
0.37 0.14
0.34 0.18
0.31 0.22
0.29
0.26
12
0.27 0.28
Show all your workings clearly.
2
54.3
53.5
54.3
52.1
51.2
Observation
51.5
52.3
50.4
50.2
D4
3.27
2.57
2.28
2.11
2.00
1.92
1.86
1.82
1.78
1.74
1.72
3
53.8
53.2
50.4
51.3
54.7
54.7
54.7
53.4
50.2
4
50.4
54.9
50.7
51.0
54.3
50.4
51.4
51.4
52.9
Chapter 10 Solutions
Principles Of Operations Management
Ch. 10 - Prob. 1EDCh. 10 - Prob. 1DQCh. 10 - Prob. 2DQCh. 10 - Prob. 3DQCh. 10 - Prob. 4DQCh. 10 - Prob. 5DQCh. 10 - Prob. 6DQCh. 10 - Prob. 7DQCh. 10 - Prob. 8DQCh. 10 - Prob. 9DQ
Ch. 10 - Prob. 10DQCh. 10 - Prob. 11DQCh. 10 - Prob. 12DQCh. 10 - Prob. 13DQCh. 10 - Prob. 14DQCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - Prob. 13PCh. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - Prob. 18PCh. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Virginia College promotes a wide variety of...Ch. 10 - Prob. 24PCh. 10 - Prob. 25PCh. 10 - Prob. 26PCh. 10 - Prob. 27PCh. 10 - Prob. 28PCh. 10 - Prob. 29PCh. 10 - Prob. 30PCh. 10 - Prob. 31PCh. 10 - Prob. 32PCh. 10 - Prob. 33PCh. 10 - Prob. 34PCh. 10 - Prob. 35PCh. 10 - Prob. 36PCh. 10 - Prob. 37PCh. 10 - Prob. 39PCh. 10 - Prob. 40PCh. 10 - Prob. 41PCh. 10 - Prob. 42PCh. 10 - Prob. 44PCh. 10 - Prob. 1CSCh. 10 - Prob. 2CSCh. 10 - Prob. 3CSCh. 10 - Prob. 4CSCh. 10 - Prob. 1.1VCCh. 10 - Prob. 1.2VCCh. 10 - Prob. 1.3VCCh. 10 - Prob. 2.1VCCh. 10 - Prob. 2.2VCCh. 10 - Prob. 2.3VCCh. 10 - Prob. 2.4VC
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