Quality_Homework2

Quality_Homework2 - Ashley Worley Quality Homework Chapter...

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Quality Homework Chapter 2 Homework 2. A. Upper Tolerance = 36 Lower Tolerance = 24 Mean = 30 Standard Deviation = 4 Actual Upper = 30+4*4 = 46 Actual Lower = 30-4*4 = 14 No, this company is not delivering six sigma quality because the upper and lower limits are closer to the mean than the actual values. B. Distance from UTL to mean = 36 – 30 = 6 4*x = 6 x = 1.5 Distance from LTL to mean = 30 – 24 = 6 4*x = 6 x = 1.5 The standard deviation must be reduced from 4 to 1.5 hours to achieve six sigma quality. 4. Upper Tolerance = 90 sec Lower Tolerance = 30 sec Mean = 60 sec Standard deviation = 6.52 sec Actual Upper = 60+6.52*6.52 = 102.51 Actual Lower = 60 – 6.52*6.52 = 17.49 90 – 60 = 30 6.52*x = 30 x = 4.6 60 – 30 = 30 6.52*x = 30 x = 4.6 This company is not operating at six sigma quality. The must reduce the standard deviation from 6.52 sec to 4.6 sec if they wish to achieve six sigma quality. 9.
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This note was uploaded on 12/02/2011 for the course QM 670 taught by Professor Dr.keeney during the Fall '11 term at Jefferson College.

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Quality_Homework2 - Ashley Worley Quality Homework Chapter...

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