ABSTRACT
When you are doing quality improvement work, you will be using or mak ing charts based on two kinds of information. In Module 3, you learned to use and construct average and range and other kinds of control charts. The type of information you need for those charts is called variable data. Re member that when you measured the motor endplay, you found that the measurements varied from one piece to the next. Variable data come from things you can measure, such as motor shaft endplay, inside diameters of brake hoses, or resistance in a resistor.
