Fujiyama Electronics, Inc. has been having difficulties with circuit boards purchased from an outside supplier. Unacceptable variability occurs between two drilled holes that are supposed to be 5 cm apart on the circuit boards. Thirty samples of 4 boards each were taken from shipments from the supplier as shown in the data from the worksheet Prob. 14-14, listed below.
1.Calculate X-Bar-Bar, R-Bar, and associated control limits using the data in the table above.
2.Create X-Bar•R (Average & Range) Control Charts from the data in the table above.
- Discuss how the two sets of Control Charts are different. What has changed?