medium · Project Management Professional Predictive (Plan-Driven)
Stonehaven Transit identifies that 80% of light rail delays are due to 'Sensor Misalignment.' A control chart of the alignment process shows that while all measurements are within the ± 3σ control limits, the last seven points have all been above the mean.
What does this 'Rule of Seven' tell the project manager?
- The project manager must immediately halt all rail operations.
- The specification limits are too tight for this process.
- The process is in control because no points are outside the limits.
- The process is out of statistical control due to an assignable cause.
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