What is it that a statistical quality control chart does?
A) it shows a graph of a series of random events of a process
B) it plots each observation relative to specified ranges that represent the expected distribution
C) it plots control observations over various periods of time
D) it plots only those observations outside specified limits

Question

Quizplus · Accepted Answer

A statistical quality control chart plots each observation relative to specified ranges that represent the expected distribution of the process. This helps to identify any significant deviations from the expected pattern and enables timely corrective action to be taken. Option A is incorrect as statistical quality control charts do not necessarily show a graph of random events, but rather an expected pattern of events. Option C is partially incorrect as control observations are plotted, but over a specific period of time. Option D is also incorrect as statistical quality control charts plot all observations, not only those outside specified limits.

What Is It That a Statistical Quality Control Chart Does