Which of the following is an example of assignable variation in a process?

A) The valve on the machine that fills paint cans has malfunctioned.
B) The operator of the paint filling machine experiences fatigue during his shift.
C) A temperature or humidity change has occurred in the factory.
D) All of these choices are true.

Assignable Variation

Variation in a process that can be traced to specific causes, as opposed to random or common cause variation.

Malfunctioned

Referred to when an item or system does not operate as intended or fails to perform its required function.

Temperature Change

The difference in temperature between two points in time or space, indicating a warming or cooling trend.