Managing for Quality and Performance Excellence 9th Edition by James Evans,William Lindsay

Exercise 34

Note: Data sets for many problems in this chapter are available in the Excel workbook C06Data.xlsx on the Student Companion Site. Click on the appropriate worksheet tab as noted in the problem (e.g., Prob. 6-1) to access the data. In addition, the spreadsheet templates illustrated in the chapter are also available to aid in solving many of these problems.
The process engineer at Sival Electronics was trying to determine whether three suppliers would be equally capable of supplying the mounting boards for the new "gold plated" components that she was testing. The table found in the worksheet Prob. 6-23 in the Excel workbook C06Data shows the coded defect levels for the suppliers, according to the finishes that were tested. Lower defect levels are preferable to higher levels. Using ANOVA, analyze these results. What conclusion can be reached?