The causes of variation in statistical process control are:
A) cycles, trends, seasonality, and random variations.
B) producer's causes and consumer's causes.
C) mean and range.
D) natural causes and assignable causes.
E) Type I and Type II.

Question

Quizplus · Accepted Answer

The causes of variation in statistical process control are classified into two categories: natural causes (also known as common causes) and assignable causes (also known as special causes). Natural causes are inherent in the process and result in random variations, while assignable causes are due to factors that can be identified and addressed to reduce or eliminate the variation. Choices A, B, C, and E are either incorrect or incomplete in describing the causes of variation in statistical process control.

The Causes of Variation in Statistical Process Control Are