A point that plots below the lower control limit on the range chart:
A)should be ignored because lower variation is desirable.
B)should be investigated for random variation.
C)may be an indication that process variation has decreased
D)is not possible
E)is due to a shift in the process mean

Question

Quizplus · Accepted Answer

A point plotting below the lower control limit on a range chart may indicate that the process variation has decreased, which could be a sign of an improvement in process consistency.

A Point That Plots Below the Lower Control Limit on the Range