An x-bar control chart can only be valid if the underlying population it measures is a normal distribution.

Question

Quizplus · Accepted Answer

An x-bar control chart can be valid for non-normal distributions, especially as the sample size increases, due to the Central Limit Theorem, which states that the sampling distribution of the sample mean approaches a normal distribution as the sample size increases, regardless of the shape of the population distribution.

An X-Bar Control Chart Can Only Be Valid If the Underlying