Natural variations:

A. lead to occasional false findings that processes are out of control.

B. play no role in statistical process control.

C. are variations that are to be identified and investigated.

D. are the same as assignable variations.

E. are variations that can be traced to a specific cause.

Answer: A

Explanation:

Natural variation also called random or chance variation is the the statistical analysis of natural fluctuations in the process outputs. It occurs when processes does not follow an accurate pattern thereby resulting into quality issues.

The knowledge of the natural variation is necessary to avoid making unnecessary adjustments to the process. Natural variability is the total effect of different minor factors. For example, older machines will show a higher level of natural variability when compared with newer machines because of worn parts and also because newer machines may have design improvements that curtail its output variability.

Answer: A. lead to occasional false findings that processes are out of control.

Explanation: natural variation sometimes lead to occasional false findings that processes are out of control when actually, they are in perfect working conditions. In addition to statistical uncertainty arising from measurement errors and so on, other natural systems have an uncertainty associated with the range of natural variability. Natural variation, sometimes just called process variation or chance variation is the statistical description of natural fluctuations in process outputs. When such instances occur (occasional false findings that processes are out of control), there is no one "true" value, and and to avoid tinkering the process, the use of statistical tools such as the mean and standard deviation are employed to describe the natural variation that occured and why it occurred.