Control-chart signal deck
Recall practical control-chart signals and anti-patterns for line adjustments.
Signal What does one point outside a control limit usually mean? Investigate a special cause before continuing as normal. The point suggests the process may have changed beyond expected common variation. Common vs special How do common-cause and special-cause variation differ? The response depends on whether the data shows routine spread or a real signal. Tampering trap A sample is low but in control. Let's nudge the filler now so we stay safe. Your line If it is in control, a blind nudge may add variation. Let's watch the next points and check for a real signal. The trap is…
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