In general,as long as random variation is absent and assignable variation remains within acceptable limits,the process is deemed to be stable,or in statistical control.

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The statement is incorrect because a process is deemed to be stable or in statistical control when only random (common cause) variation is present, and there is an absence of assignable (special cause) variation. Assignable variation indicates that the process is not stable.

In General,as Long as Random Variation Is Absent and Assignable