Exam1_S09 - Statistics 496, Applied Statistics for Industry...

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Unformatted text preview: Statistics 496, Applied Statistics for Industry II Name: _________________ Exam 1, Spring 2009 Site: ___________________ INSTRUCTIONS: You will have 1 hour and 30 minutes to complete the exam. There are 5 questions worth a total of 100 points. Not all questions have the same point value so gauge your time appropriately. Read the questions carefully and completely. Answer each question and show work in the space provided on the exam. Turn in the entire exam when you are done or when time is up. For essay questions, think before you write. 1. [30 pts] As part of the quality assurance program a customer service call center monitors the response time, the time between the first ring until a service representative answers the call. The target time is 30 seconds with upper and lower specification limits of 0 seconds and 60 seconds, respectively. Six response times are selected, at random, from each of 50 shifts. Refer to the JMP output “Call Pickup Time.” a) [6] Looking at the control charts on page 1 of the output, comment on the stability of the response time process. Use all points within control limits as your definition of statistical control. Be specific and be sure to comment on both charts. b) [4] Special causes were identified and removed from the response time process. Looking at the control charts on page 2 of the output, comment on the stability of the response time process. Use all points within control limits as your definition of statistical control. Be specific and be sure to comment on both charts....
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This note was uploaded on 02/11/2012 for the course STAT 496 taught by Professor Staff during the Spring '08 term at Iowa State.

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Exam1_S09 - Statistics 496, Applied Statistics for Industry...

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