Which of the following statements is TRUE about common cause variations?
A) They can be controlled and described in a non-statistical method.
B) They appear at random, and individual sources cannot be identified or explained.
C) They account for about 10 to 15 percent of the observed variation in a process.
D) They arise from external sources that are not inherent in the process.

Question

Quizplus · Accepted Answer

Common cause variations are inherent in the process and appear at random. They cannot be identified or explained by individual sources or factors. This is in contrast to special cause variations, which can be attributed to specific and identifiable sources and can be controlled using statistical methods. Common cause variations account for the majority of the observed variation in a process, typically around 85 to 90 percent.

Which of the Following Statements Is TRUE About Common Cause