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Questions
[40 points, 4 points each]
1.
Consider an M/M/k queue with arrival rate
λ
and service rate
μ
and an M/G/k queue with the same
arrival rate
λ
and service rate
μ
.
a.
Which of these two queues has a larger Lq?
Cannot tell
b.
Which of these two queues has a higher utilization rate
ρ
?
Same
2.
Which of the following is not needed for the calculation of the EOQ?
a.
Setup/ordering cost
b.
Leadtime
c.
Holding cost
d.
Demand
e.
None of the above
3.
Which forecasting method below should perform better given the following data?
20
70
120
170
220
270
320
0
2
4
6
8
10
12
14
Months
Actual Sales Data
a.
Moving average with a small N.
b.
Moving average with a large N.
c.
The seasonality method in the slides.
d.
Exponential smoothing with a large alpha.
e.
Exponential smoothing with a small alpha
4.
Please complete the following:
a.
Anxiety makes waits seem
longer
.
b.
Preprocess waits feel
longer
than inprocess waits.
c.
Uncertain waits feel
longer
than known/finite waits.
d.
Unexplained waits feel
longer
than explained waits.
e.
Unoccupied waits feel
longer
than occupied waits.
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View Full Document 5.
Which of is the following is NOT an assumption of the EOQ model?
a.
The leadtime is constant.
b.
The unit cost is constant.
c.
Demand is known/constant.
d.
The ordering/setup cost is constant.
e.
None of the above
6.
Which of the following is NOT true about the EOQ model?
a.
In some cases, the unit cost is not used in calculating the (annual) inventory holding cost per unit.
b.
The average inventory level is always Q/2 regardless of the leadtime.
c.
When the leadtime is longer than an inventory period/cycle, the EOQ formula must not be used.
d.
If the order quantity equals the EOQ then the holding and ordering/setup costs will also be (about)
equal to each other, on an annual basis.
e.
None of the above.
7.
You are an employee of the USC Credit Union currently assessing the minimum number of ATMs
required at the Student Commons lobby to ensure that the probability a customer will have to wait
for an ATM will be less than 35%. A previous statistical study determined that customers arrive ac
cording to a Poisson process at the rate of 24 per hour and the average amount of time a customer
spends using an ATM is 5 minutes and follows an exponential distribution. What should be your an
swer?
a.
3
b.
4
c.
5
d.
6
e.
Cannot be determined with only the information above.
8.
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This note was uploaded on 10/15/2007 for the course BUAD 311 taught by Professor Vaitsos during the Spring '07 term at USC.
 Spring '07
 Vaitsos
 Management

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