Proportion Defective Proportion Defective Sample Number Sample Number 1 .04 7 .10 2 .02 8 .10 3 .06 .06 4 .08 10 .08 .08 11 .04 6. .04 12 .04
Proportion Defective Proportion Defective Sample Number Sample Number 1 .04 7 .10 2 .02 8 .10 3 .06 .06 4 .08 10 .08 .08 11 .04 6. .04 12 .04
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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Question
Over a period of 12 consecutive production hours, samples of size 50 resulted in the following proportions of defective items: (given)
a. What are the three-sigma control limits for this process?
b. Do any of the sample points fall outside of the control limits?
c. The company claims a defect rate of 3 percent for these items. Are the observed proportions consistent with a target value of 3 percent defectives? What difficulty would arise if the control limits were based on a target value of 0.03? In view of the company’s claims, what difficulty would arise if the control limits computed in part (a) were used?
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