Control chart
Which bad days are noise, and which are a signal?
Individuals chart of daily seat-face rejects. The open point is 9, past the upper limit. The day at 8 stays inside it.
How this sheet sits with the others
The individuals chart is centered at 2.75, with an average moving range of 2.32, an upper limit of 8.91, and a lower limit of 0. A day at 8 is inside the limits. A day at 9, a Thursday expedite, is past the limit. A high day and a signal are different facts. The chart does not say why, and it does not support a capability claim.
- What it makes visible
- Twenty daily seat-face reject counts against a center line and moving-range limits.
- When it is useful
- When a high day might be ordinary noise, or might be a signal.
- Who uses it
- Priya Shah’s reject count, read before anyone claims capability.
- What it takes
- The twenty daily seat-face reject counts.
- What it leaves
- Mean 2.75, average moving range 2.32, upper limit 8.91, lower limit 0. The value 9 is past the limit. The value 8 is inside.
- The underlying record
- Daily seat-face rejects from Devon Cho's cell, including the Thursday expedite past the limit and the high day that stays inside it, are the stability fact the capability and run-chart sheets depend on.
Where these facts go next
What this sheet still leaves out
It has no cause, and it has no capability.