Statistical_Quality_Control

Statistical_Quality_Control - light *Below LCL,...

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04/26/11 1 Statistical Quality Control Dr. Myril Hillman
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04/26/11 2 Statistical Quality Control Involves sampling Each sample has a mean
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04/26/11 3 Calculations Mean of the means Standard error of the mean
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04/26/11 4 “Control Charts”: Graphical Analyses “Control limits” Upper control limit:UCL +3 standard errors from mean (of the sample means) Lower control limit:LCL -3 standard errors from mean (of the sample means)
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04/26/11 5 Out of Control Sample mean is outside acceptable area, either Above UCL, or Below LCL
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04/26/11 6 Example Potato chips sample has mean of chip color If mean is: *Above UCL, significantly too
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Unformatted text preview: light *Below LCL, significantly too dark 04/26/11 7 OUT OF CONTROL When mean is above UCL, or When mean is below LCL Concern over quality-Look for assignable causes 04/26/11 8 Assignable Causes In manufacturing, examples of possible causes are Incorrect readings Inexperienced operators Equipment which needs to be calibrated 04/26/11 9 Excessive Variability Not Outside Control Limits Indicates non-random variability Inspect, see what might be cause(s) Might be aging equipment Overhaul (if necessary)...
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This note was uploaded on 04/25/2011 for the course MKT 202 taught by Professor Hillman during the Spring '10 term at DePaul.

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Statistical_Quality_Control - light *Below LCL,...

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