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MM305_Unit8_Project to be done

# MM305_Unit8_Project to be done - 19.7 19.8 20.3 20.2 1 P.M...

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MM305 Quantitative Analysis for Managers Unit 8 Project Please download this document to your computer and save it using the naming  convention specified in the course syllabus.  After completing and saving the project  problems, submit your project in the Drop Box for Unit 8. 1. Precision Manufacturing has a government contract to produce stainless steel rods for use in  military aircraft.  Each rod is required to be 20 millimeters in diameter. Each hour, random  samples of size n = 4 rods are measured to check process control. Five hours of observations  yielded the following: Diameter Time Rod 1 Rod 2 Rod 3 Rod 4 9 A.M. 19.8 20.4 19.9 20.3 10 A.M. 20.1 20.2 19.9 19.8 11 A.M. 19.9 20.5 20.3 20.1 Noon

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Unformatted text preview: 19.7 19.8 20.3 20.2 1 P.M. 19.7 20.1 19.9 19.9 Using these data and the table below, construct limits for xbar- and R-charts. Is the process in control? Control Chart Limits Factors Sample Size n Mean Factor A 2 Upper Range D 4 Lower Range D 3 2 1.880 3.628 3 1.023 2.574 4 0.729 2.282 5 0.577 2.114 6 0.483 2.004 7 0.419 1.924 0.076 8 0.373 1.864 0.136 9 0.337 1.816 0.184 10 0.308 1.777 0.223 12 0.266 1.716 0.284 2. A p-chart has been developed for a particular item. In the past, 3% of such items have been found to be defective. If a sample of 100 is taken, and 9 of these are found to be defective, should the process be considered out of control? Explain....
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