A plot below the lower control limit on the range chart
(I)should be ignored since lower variation is desirable.(II)may be an indication that process variation has decreased.(III)should be investigated for assignable cause.
A)I and II
B)I and III
C)II and III
D)II only
E)I, II, and III

Question

Quizplus · Accepted Answer

A plot below the lower control limit on the range chart
(I) should be ignored since lower variation is desirable.(II) may be an indication that process variation has decreased.(III) should be investigated for assignable cause.

A Plot Below the Lower Control Limit on the Range