cl05_Quality_Management_II

It depends on the mix of ingredients roasting time

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Unformatted text preview: important quality characteristic. It depends on the mix of ingredients, roasting time and temperature. Spreadability is determined by dropping a needleneedle-like probe into a jar of peanut butter and measuring its depth after ten seconds. Is Is the process in control? 19 Stephen Shum Spring 2009 Preparing Preparing X-chart Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 A 0.94 1.10 1.23 0.91 0.81 1.07 1.26 1.11 1.05 1.60 1.54 1.33 1.24 B 0.87 1.05 1.65 0.82 0.76 1.18 1.09 1.51 0.95 0.84 0.96 1.22 1.09 C 1.15 0.78 0.67 1.20 1.36 1.24 1.49 1.14 0.90 1.41 1.33 1.33 1.31 D 1.01 1.07 1.21 1.37 0.71 0.96 1.12 0.90 1.08 1.30 0.99 1.46 1.12 X 0.99 1.00 1.19 1.07 0.91 1.11 1.24 1.17 0.99 1.29 1.21 1.33 1.19 Sample 14 15 16 17 18 19 20 20 21 22 23 24 24 25 A 0.79 0.92 0.78 1.29 1.36 1.20 1.47 0.67 1.05 1.02 1.24 1.12 B 1.27 1.47 1.61 1.07 0.98 1.27 1.09 1.35 1.54 1.48 1.25 1.23 C 1.07 0.87 1.23 1.60 1.33 1.58 1.59 1.46 0.96 1.31 0.94 1.07 D 1.27 1.35 1.00 1.15 1.51 1.18 1.27 0.95 1.53 1.23 1.47 1.12 X 1.10 1.15 1.16 1.28 1.29 1.31 1.36 1.11 1.27 1.26 1.22 1.14 X = sample average = average of 4 measurements in the sample sample average average of measurements in the sample 20 Stephen Shum Spring 2009 X-chart Control Limits = Average of X + 3 Standard Deviation of X 1.6 1.5 UCL = 1.526 1.4 1.3 1.2 Center = 1.17 1.17 1.1 1 0.9 LCL = 0.821 0.8 0.7 0 5 10 15 21 20 25 Stephen Shum Spring 2009 Control Control Charts: Evidence for Investigation for Investigation In Control vs. Capable In Control vs. Capable Who Has the Better Shots? In-control : the process is consistent over time. Capable : the output of the process meets design specs with the output of the process meets design specs a very high probability. 23 Stephen Shum Spring 2009 Learning Objectives Learning Objectives Process Control Control Continuous Continuous Improvement • Common Cause Variation vs. Assignable Cause Variation • In Control vs. Out of Control Control vs Out of Control • Process Control Charts • Control Limits vs. Specification Limits • Process Capability Index 24 Stephen Shum Spring 2009 Control...
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