In a control chart, expected variation is defined by the
A) standard deviation.
B) standard error of the distribution.
C) only upper control limits.
D) upper and lower control limits.

Question

Quizplus · Accepted Answer

Expected variation in a control chart is defined by upper and lower control limits which are calculated using the standard deviation of the data. Therefore, the correct choice is D. Option A is partially correct as it relates to the calculation of control limits, but it is not the definition of expected variation. Option B is incorrect as it relates to the precision of the mean estimate rather than the expected variation. Option C is incorrect as it does not take into account the lower control limit, which is necessary for defining expected variation.

In a Control Chart, Expected Variation Is Defined by the