18. Amertron produces electrical wiring in 100-foot rolls. The quality inspectionprocess involves selecting rolls of wire at random and counting the number of de-fects on each roll. The last 20 rolls examined revealed the following numbers ofdefects:RollNumber of DefectsRollNumber of Defects14112212531354414711516487178181943310204a. If the number of defects per 100-foot roll of wire follows a Poisson distribution,what is the estimate of c obtained from these observations?b. Using a normal approximation to the Poisson, what are the three-sigma controllimits that you would use to monitor this process?c. Are all 20 observations within the control limits?

Answered: 18. Amertron produces electrical wiring…

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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Daily samples of I 00 power drills are removed fromthe assembly line at Drills by Stergios Fotopoulos and inspectedfor defects. Over the past 21 days, the following information hasbeen gathered. Develop a 3 standard deviation (99.73% confidence)p-chart and graph the samples. Is the process in control?
621 Daily samples of 100 power drills are removed from Drill Master's assembly line and in- spected for defects. Over the past 21 days, the following information has been gathered. Develop a 3 standard deviation (99.73% confidence) p-chart and graph the samples. Is the process in control? Number of Defective Drills Number of Defective Drills Day Day 6. 12 13 4 5. 14 3 15 16 17 6. 18 5. 8. 19 9. 20 3 10 21 7 11 643t n36 37 123 456N
The ability of a process to meet design specifications iscalled:a) Taguchi.b) process capability.c) capability index.d) acceptance sampling.e) average outgoing quality.
Walton Company has measured its quality costs for the past two years. After the company gathers its quality cost data, it summarizes those costs using the four categories shown below: Last Year This Year Prevention costs $ 349,900 $ 617,500 Appraisal costs $ 449,500 $ 523,200 Internal failure costs $ 805,800 $ 520,000 External failure costs $ 1,111,000 $ 673,200 1. Calculate the change in total cost of quality over the two-year period. 2. Is performance trending in a favorable or unfavorable direction?
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The measurement of 85 automotive cables gave an arithmetic mean of the inner diameters of 3.51 mm and a standard deviation of 0.02 mm.The value required by the manufacturer is 3.5 upper/lower tolerance +0.04/ -0.12It is requested : a. Calculate the capability coefficients Cp, Cpk and state whether or not the machine is capable of producing compliant parts, i.e. whether or not the data dispersion is well centred. If applicable, calculate the adjustment coefficient Cr.b. If scrap is obtained, state whether it is recoverable or non-recoverable and calculate the percentage of scrap.c. Plot the limits of the tolerance field and the distribution of the measured data (using mean and standard deviation).
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1
380,000 automotive A-Frame brackets are stamped in a year with a complex process involving shearing, forming, stamping, and heat treating. Each bracket has 6 Critical To Quality features. 627 brackets had at least one defect. Evaluation of the 627 brackets showed a total of, 1191 defects. Calculate the defects per million opportunities (DPMO). Calculate the defects per million (DPM). Calculate the defective units per million (DUPM).

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