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Unformatted text preview: (d) If the instructor wishes to illustrate the concept of setting valid control limits, he/she can have the students eliminate out of control points. The correct process is to eliminate the range outliers first. Here there are none. If we eliminate the offending sample number 3, the recomputed limits would be: Revised Control Limits Are both the Mean Sample and Range Sampl e Mean (in.) Range (in.) in Control? 1 10.002 0.011 Y 2 10.002 0.014 Y 3 4 10.006 0.022 Y 5 9.997 0.013 Y 6 9.999 0.012 Y 7 10.001 0.008 Y 8 10.005 0.013 Y 9 9.995 0.004 Y 10 10.001 0.011 Y 11 10.001 0.014 Y 12 10.006 0.009 Y These limits reflect a process that is now in control. S6.12 mph, Z = 3 , with n = 8, from Table S6.1, D 4 = 1.864, D 3 = .136 Note that in this problem much more information is provided than the student needs to compute the answer. This process is barely capable. S6.30 S6.32...
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 Spring '11
 smith
 155 mm

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