medium · Project Management Professional predictive

Peakstone Rail uses control charts to monitor the width of rail gaps. The latest data points are all within the upper and lower control limits, but the last seven points are consistently above the mean.

What is the most appropriate interpretation of this data?

  1. The process is in a state of statistical control.
  2. The rail gaps are exceeding the specification limits.
  3. The process is out of control and requires investigation.
  4. The control limits must be widened to account for the new mean.

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