An estimator of the process standard deviation is the average _____ divided by a constant that depends on the sample size.
A) control
B) limit
C) constant
D) range

Question

Quizplus · Accepted Answer

The correct answer is D) range. In statistical process control, the average range is often used as an estimator for the process standard deviation. This estimation is divided by a constant that depends on the sample size, known as the d2 constant, to ensure the estimate is unbiased.

An Estimator of the Process Standard Deviation Is the Average