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  • Operations Management 생산운영관리 krajewski ritzman malhotra 5장 연습문제풀이

  • Operations Managemen.hwp
  • 등록인 repojaehoon
  • 등록/수정일 17.03.02 / 17.03.02
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Operations Management 생산운영관리 krajewski ritzman malhotra 5장 연습문제풀이
4. at Quikie Car Wash, the process is advertised to take less than 6 minute. Consequently, management has set a target average of 340 seconds for the wash process. Suppose the average range for a sample of 9 cars is 9 seconds. Use table 5.1 to establish control limits for sample means and ranges for the car wash process.
9. TheIRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correct responses has been 72 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were asked of 20 randomly selected IRS telephone representatives. The number of c
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Operations Management 생산운영관리 krajewski ritzman malhotra 5장 연습문제풀이
4. at Quikie Car Wash, the process is advertised to take less than 6 minute. Consequently, management has set a target average of 340 seconds for the wash process. Suppose the average range for a sample of 9 cars is 9 seconds. Use table 5.1 to establish control limits for sample means and ranges for the car wash process.
9. TheIRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correct responses has been 72 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were asked of 20 randomly selected IRS telephone representatives. The number of correct answers were 18, 16, 19, 21, 20, 16, 21, 16, 17, 10, 25, 18, 25, 16, 20, 15, 23, 19, 21, 19.
14. The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen samples of 5 completed mortgage transactions each were taken during a period when the process was believed to be in control. The times to complete the transactions were measured. The means and ranges of the mortgage process transaction time, measured in days, are as follows:
19. Janice Sanders, CEO of Pine Crest Medical Clinic, is concerned over the number of times patients must wait more than 30 minutes beyond their scheduled appointments. She asked her assistant to take random samples of 64 patients to see how many in each sample had to wait more than 30 minutes. Each instance is concerned a defect in the clinic process. The table below contains the data for 15 samples.
24. The Money Pit Mortgage Company of Problem 14 made some changes to the process and undertook a process capability study. The following data were obtained for 15 samples of size 5. Based on the individual observations, management estimated the process standard deviation to be 4.21 (days) for use in the process capability analysis. The lower and upper specification limits (in days) for the mortgage process times were 5 and 25.
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