A process is checked at random by inspection of samples of four shafts after a polishing operation, and X-bar and R charts are maintained. A person making a spot check measures two shafts accurately, and plots their range on the R chart. The point falls just outside the control limit. He advises the department foreman to stop the process. This decision indicates that:

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A process is checked at random by inspection of samples of four shafts after a polishing operation, and X-bar and R charts are maintained. A person making a spot check measures two shafts accurately, and plots their range on the R chart. The point falls just outside the control limit. He advises the department foreman to stop the process. This decision indicates that: