Managing Supply Chain and Operations 1st Edition by Thomas Foster ,Scott Sampson,Cynthia Wallin,Scott Webb

Exercise 26

A lumber company makes plywood for commercial construction. A key quality measure is the thickness of the plywood Every two hours, five pieces of plywood (n = 5) are selected, and the thicknesses are measured. The data (in inches) for the first 20 samples are as follows: Use Excel to develop an R chart to determine if the range of the process is stable or not.