midterm 2b solved spring 07

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

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Unformatted text preview: Questions [40 points, 4 points each] 1. Consider an M/M/k queue with arrival rate and service rate and an M/G/k queue with the same arrival rate and service rate . a. Which of these two queues has a larger Lq? Cannot tell b. Which of these two queues has a higher utilization rate ? Same 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 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. 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. 5. Which of is the following is NOT an assumption of the EOQ model? a. The lead-time 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 lead-time. c. 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. d. When the lead-time is longer than an inventory period/cycle, the EOQ formula must not be used. 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 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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This homework help was uploaded on 10/15/2007 for the course BUAD 311 taught by Professor Vaitsos during the Spring '07 term at USC.

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

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