Problem 3.1. Plot of raw data R-chart What about subgroup 8? Raw data indicates a possible outlier. May also be isolated special cause. Check measurement.

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Presentation transcript:

Problem 3.1

Plot of raw data

R-chart

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.

X-bar chart

What about subgroups 4,7 and 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.