If your control chart found a series of points all lying within 3 standard errors above the center line,and none lying below the centerline,this could be an indication of assignable variation due to a(n)____________________.

Assignable Variation

Variation in a process that is caused by specific, identifiable factors, as opposed to random or inherent variability.

Standard Errors

Standard errors measure the statistical accuracy of an estimate, indicating the variability of sampling distributions of a statistic.