Precision Technologies has been having a problem with the computerized welding operation in its extractor assembly line. The extractors are used to separate metal shavings into piles of individual metals for recycling and scrap sales. The time for each welding operation has been increasing at an erratic rate. Management has asked that the time intervals be analyzed to see if the cause of the problem can be determined. The number of parts welded per shift during the previous week is as follows:

What can you deduce from this information that may help management solve the welding operation problem?

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Machine Number Monday Tuesday Wednesday Thursday Friday 602 738 686 First shift: Kovacs Abington Geisler Second shift Deragon Berwager Grass 642 732 745 636 736 726 625 735 617 729 694 426 654 526 416 656 524 410 661 510 404 664 504 398 670 502