A control chart consists of several parts. It has two control limits and an average line. The bottom dashed line is called the lower control limit (LCL). The solid middle line is the average of the ...

Quintiles are simply four numbers that break up numerical data sets into five equal parts. For example, if you took the number set of 1,2,3 and 4, the quintiles would be 1.6, 2.2, 2.8 and 3.4, as the ...