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

Exercise 35

A chocolate company makes candy bars to be used by elementary schools for fund-raising. One of the important quality characteristics is the weight of the bar. To monitor the weights, the production team wants to use process control charts. Data for 30 samples of 4 bars each are as follows: Use Excel to develop an R chart to determine if the range of the process is stable or not.