4.docx - 4(24 points A company manufactures an electrical...

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4. (24 points) A company manufactures an electrical cooling fan. It is concerned about the performance of its production process. Over the past 10 days, it has collected samples of performance of the process. There were 8 observations in each sample. Measurements Day 1 2 3 4 5 6 7 8 9 10 Mean 12.50 12.45 12.55 12.50 12.45 12.60 12.48 12.46 12.56 12.48 Range 1.1 1.2 0.9 0.8 0.9 1.0 1.4 1.1 0.9 0.8 Additional information that you might need is provided on the next page. a) Establish the appropriate control limits for the control chart(s) that would be used to determine if the process in control? ∑x-bar = 125.03 x-bar bar = 125.03/10 = 12.50 ∑R = 10.1 R-bar = 10.1/10 = 1.00 X-bar control limits:
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  • Summer '08
  • THOMAS
  • Want, 10 days, UCL, x-bar control limits, electrical cooling fan

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