Assignment:
A marker manufacturer wants to determine process control charts for a machine that cuts the plastic for marker height. The following table shows the first 8 samples of 6 markers of the production of the marker. (i.e., z = 3).
Sample 1 2 3 4 5 6 7 8
X‾ 10.00 9.98 9.97 10.01 10.00 10.00 10.02 9.97
range .01 .01 .03 .02 .04 .02 .03 .04
1. What are the upper and lower control limits for the X chart? Answers must be accurate to at least 4 decimal places.
2. What are the upper and lower control limits for the R chart? Answers must be accurate to at least 4 decimal places.