M&M’s Cpk - PowerPoint PPT Presentation

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M&M’s Cpk

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  1. M&M’s Cpk Dr. Ron Tibben-Lembke SCM 462/662 Fall, 2007

  2. Peanut

  3. Plain

  4. Packaging Weight • Peanut: 15 weighed 10.94 = 0.73g • Plain: 30 weighed 22.25 = 0.74 g • Use average value 0.738 g Outer Bags: Peanut: 8.22g Plain: 7.82 g average Took raw data, subtracted off package weight

  5. Plain Bag Mass (weight)

  6. Plain Variability • Avg Stdev CV • Grams 18.356 0.856 0.04 • % below 18g: 25.7% • Cpk: (18.356 – 18)/3*0.856 = 0.426 • Verdict? Not Capable

  7. Peanut Bag Weight

  8. Peanut Variability • Avg Stdev CV • Grams 17.15 1.41 0.082 • % below 18g: 73.7% • Cpk: (17.15-18)/3*1.41 = • =-0.227 • Verdict? Definitely Not Capable

  9. So did we get cheated? • Peanut: 325.75 g Label: 318.4 • Plain: 317.39 g Label: 316.7 325.06 g 316.7 Not by much, but we got what we paid for.

  10. Peanut Candy Weights • Avg. 2.18, stdv 0.242, c.v. = 0.111

  11. Plain Candy Weights • Avg 0.858, StDev 0.035, C.V. 0.0413