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Unformatted text preview: 6.15. (a) MTB > Stat > Control Charts > Variables Charts for Subgroups > XbarR Yes, the process is in control—though we should watch for a possible cyclic pattern in the averages. 6.15 continued (b) MTB > Stat > Control Charts > Variables Charts for Subgroups > XbarR Under “Options, Estimate” use subgroups 1:20 to calculate control limits. Test Results for R Chart of Ex6.15bSt TEST. One point more than 3.00 standard deviations from center line. Test Failed at points: 25, 26, 27, 31, 33, 34, 35 A strongly cyclic pattern in the averages is now evident, but more importantly, there are several outofcontrol points on the range chart. 6.16. (a) MTB > Stat > Control Charts > Variables Charts for Subgroups > XbarS Under “Options, Estimate” use subgroups 1:20 to calculate control limits. Test Results for Xbar Chart of Ex6.15bSt TEST 1. One point more than 3.00 standard deviations from center line....
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 Fall '06
 PALMER
 Standard Deviation, Control Chart, USL, 0.36 M

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