Roman Numerals and Process - 1682 Words

Chapter 09a Process Capability and Statistical Process Control Review and Discussion Questions 1. The capability index allows for some drifting of the process mean. Discuss what this means in terms of product quality output. When Cpk is larger then 1.33 or 1.5, this means that the mean of the process can drift (up to a limit) while still producing within specifications. This is what is implied by the phrase â€Å"a capable process. 2. Discuss the purposes and differences between the P-charts and X-bar and R charts. P-charts are used to monitor the process for attribute data. These are typically binomial â€Å"go, no-go† data. An example of a P-chart is percent of pieces nonconforming. X-bar charts are used for charting population values†¦show more content†¦Defective average = .04, inspection rate = 50 per hour, cost of inspector = $9 per hour, and repair cost is $10 each. a. | Calculation | Cost per hour | No inspection | .04 * (50) * $10 | $20 | Inspection | | 9 | Therefore, it is cheaper to inspect in this case. b. Cost per unit for inspection = $9/50 = $.18 c. Benefit form the current inspection process is Hourly: cost of no inspection – cost of inspection ($20 - $9 = $11) Per unit: average cost of quality – cost of inspection ((.04)$10 - $.18 = $.22) 2. a. = .889 b. The process is capable of producing the desired quality, but at present it is not capable due to the process center. The process center should be adjusted. 3. a. Ten defectives were found in 10 samples of size 15. = .067 = .0645 UCL = + 1.96 = .067 + 1.96(.0645) = .194 LCL = - 1.96 = .067 - 1.96(.0645) = -.060 zero b. Stop the process and look for the special cause, it is out of statistical control. 4. Defective average = .02, inspection rate = 20 per hour, cost of inspector = $8 per hour, and replacement cost is $25 each. a. | Calculation | Cost per hour | No inspection | .02(20)$25 | $10 | Inspection | | 8 | Therefore, it is cheaper to inspect in this case. b. Cost per unit for inspection = $8/20 =Show MoreRelatedRoman Numeral System1511 Words   |  6 PagesRoman Numeral System Origin: Roman numerals were created some time between 900s and 800s B.C. in ancient Rome. The Roman numerals were created as a type of counting method, which was needed for trade. Because trade was getting bigger, the Roman Numerals became a big help when they needed to add and subtract their profits and such. The Roman Numerals used to just be one symbol each. For example, I, V, X, L, C, D, M are seven symbols that were the independent symbols. 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