Solution Manual for Simulation with Arena 6th Edition by Kelton-07

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Exercise 2-7 Solution file from Kelton/Sadowski/Zupick, Simulation With Arena, 6th edition, McGraw-Hill, 2015
Here are the results from the original model (i.e., Table 2-4), followed by those from the new model, with the new summary measures in italics:
Original Model
Replication
Sample
Performance Measure
1
2
3
4
5
Average
Std. Dev.
Half Width
Total production
5
3
6
2
3
3.80
1.64
2.04
Average waiting time in queue
2.53
1.19
1.03
1.62
0.00
1.27
0.92
1.14
Average total time in system
6.44
5.10
4.16
6.71
4.26
5.33
1.19
1.48
Time-average no. parts in queue
0.79
6.63
0.36
0.16
0.05
1.60
2.83
3.51
Drill-press utilization
0.92
0.59
0.90
0.51
0.70
0.72
0.18
0.23
Double-Time Arrivals
Replication
Sample
Performance Measure
1
2
3
4
5
Average
Std. Dev.
Half Width
Total production
6
4
6
4
5
5.00
1.00
1.24
Average waiting time in queue
7.38
2.10
3.52
2.81
2.93
3.75
2.09
2.60
Average total time in system
10.19
5.61
5.90
6.93
5.57
6.84
1.95
2.42
Time-average no. parts in queue
2.88
0.52
1.71
0.77
2.25
1.63
0.99
1.23
Drill-press utilization
1.00
0.92
1.00
0.95
1.00
0.97
0.04
0.05
One not-quite-right, but still-reasonable, approach is to see if the original-model and changed-model confidence intervals for a given measure overlap or not—if they overlap we’re not getting a clear indication of a real difference. Taking a look at the above results, all five pairs of confidence intervals overlap, so while the averages seem to indicate higher production, congestion, and utilization, there is just too much uncertainty to conclude this firmly. There is a quite-right-indeed way to do this comparison, and Arena has a built-in way to help you do it (in the Output Analyzer); see Chapter 6.
This file was downloaded
from the Solutions area of
the website for the 6th ed.
of "Simulation With Arena"
by Kelton, Sadowski, and
Zupick, McGraw-Hill, 2015.