TB MC Qu$.09-03$ Which of the following statements...

Which of the following statements about process quality control is NOT true?

Multiple Choice

Assignable cause variation is also referred to as special cause variation.

An observation outside the control limits is an example of a special cause of variation.

Common cause variation can be eliminated from the process by removing the potential causes.

When the upper and lower control limits are set at $\backslash$pm three standard deviations from the mean, the control limits will include $99\mathrm{.}74$ percent of the population under the normal probability distribution assuming that the process is in control.