Problem 3.1 - 12 What’s possible • Subgroups 4 and 7 don’t show a lot of variability • Check production conditions for those subgroups •

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Problem 3.1
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Plot of raw data
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R-chart
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What about subgroup 8? Raw data indicates a possible outlier. May also be isolated special cause. Check measurement system. Check production conditions at time and location of observation.
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X-bar chart
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What about subgroups 4,7 and
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Unformatted text preview: 12? What’s possible. • Subgroups 4 and 7 don’t show a lot of variability. • Check production conditions for those subgroups. • Subgroups 12 is marginal and there was more variability in that data. • Maybe false signal, maybe not....
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This note was uploaded on 02/20/2012 for the course STAT 513 taught by Professor Na during the Spring '11 term at Purdue University-West Lafayette.

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Problem 3.1 - 12 What’s possible • Subgroups 4 and 7 don’t show a lot of variability • Check production conditions for those subgroups •

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