Sort Control-Chart Signals
Classify SPC situations as common cause, special cause, or tampering risk.
Sort each chart-review statement by what it represents. Common-cause movement Special-cause signal Tampering response One weekly point rises slightly but remains inside limits with no run pattern The process average is stable but consistently worse than the customer CTQ target Small up-and-down movement appears around the center line across normal weeks One point falls outside the upper control limit after a routing-rule deployment Eight consecutive points sit above the center line after a supplier change Weekend points form a repeating high pattern that weekday points do not show The manager changes staffing rules after every weekly point that is higher…
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