Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Chapter 10, Problem 1CS
Summary Introduction
Case summary:
Person K is the vice-president of operations at Company J, which received a request for quote of supplying 400 units per week. Employee must be permitted to perform the task for 17 times. The actual times observed were given below:
| Number | Actual time (minutes) |
| 1 | 2.05 |
| 2 | 1.92 |
| 3 | 2.01 |
| 4 | 1.89 |
| 5 | 1.77 |
| 6 | 1.8 |
| 7 | 1.86 |
| 8 | 1.83 |
| 9 | 1.93 |
| 10 | 1.96 |
| 11 | 1.95 |
| 12 | 2.05 |
| 13 | 1.79 |
| 14 | 1.82 |
| 15 | 1.85 |
| 16 | 1.85 |
| 17 | 1.99 |
Performance rating is 115%, fatigue allowance is given as 8%, personal allowance is 6%, and delay allowance is 2%. Workday hour is 7.5 hours and the operators would be paid $12.50 per hour for 8 hours.
To determine: The
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How big should the sample be for a statistically accurate standard(at, say, the 99.73% confidence level and accuracy of ±5%)?
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
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9
10
5
6
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10
9
10
9
12
8
9
8
9
9
8
12
11
9
9
6
10
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5
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10
9
4
12
4
7
3
8
8
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12
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4
11
5
4
2
9
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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
Archeologists plan to examine a sample of 2-meter square plots near an ancient Greek city for
artifacts visible in the ground. They choose a certain number of separate samples of plots from
floodplain, coast, foothills, and high hills.
What kind of sampling strategy is this?
a. A cluster random sample
b. A simple random sample, SRS
C. A systematic random sample
d. A stratified random sample
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Chapter 10 Solutions
Operations Management
Ch. 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. 9DQCh. 10 - Prob. 10DQ
Ch. 10 - Prob. 11DQCh. 10 - Prob. 12DQCh. 10 - Prob. 13DQCh. 10 - Prob. 14DQCh. 10 - Prob. 1PCh. 10 - Draw an activity chart for a machine operator with...Ch. 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 - Prob. 23PCh. 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. 38PCh. 10 - Prob. 1CSCh. 10 - Prob. 2CSCh. 10 - Prob. 3CSCh. 10 - Prob. 4CSCh. 10 - Prob. 1VCCh. 10 - Prob. 2VCCh. 10 - Prob. 3VCCh. 10 - Prob. 4VC
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