What is an R chart used for?

A) To monitor the center of a process
B) To monitor the spread of a process
C) To monitor both the center and spread of a process
D) To monitor the correlation of a process

R Chart

R Chart, or range chart, is a type of control chart used in statistical process control to monitor the variability of a process based on samples taken from the process at given times.

Process Spread

Process spread refers to the variability within a process, often measured to assess the consistency of output over time.

Monitor

To regularly observe or check something over a period of time for the purpose of keeping track of its state or progress.