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HowtoReadControlCharts - • Several data points near UCL...

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How to Read a Control Chart Data points outside UCL or LCL Data points show a trend (5-7 points) Data points converge below or above the center line Data points show sudden change – e.g. 3 points rising, I point down step changes
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Unformatted text preview: • Several data points near UCL or LCL (normally only 1 in 20 observations are more than +-2 std. Deviations from the mean)...
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