midterm 2b solved spring 07 - Questions[40 points 4 points...

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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 ρ 2. Which of the following is not needed for the calculation of the EOQ? a. Setup/ordering cost b. Holding cost c. Lead-time 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 4. Please complete the following: a. Anxiety makes waits seem longer . b. Pre-process waits feel longer than in-process 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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5. Which of is the following is NOT an assumption of the EOQ model? 6. Which of the following is NOT true about the EOQ model? 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 40%. A previous statistical study determined that customers arrive ac- cording to a Poisson process at the rate of 18 per hour and the average amount of time a customer spends using an ATM is 10 minutes and follows an exponential distribution. What should be your answer? a. 3 b. 4 c. 5 d. 6 e. Cannot be determined with only the information above.
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