Quality management

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_2 Sample Number 1 SE900 0.0011 2 Q4. The thickness of a printed circuit board is an important quality parameter. Data on board thickness (in inches) are given in Table for 25 samples of three boards each. a. Set up and control charts. Is the process in statistical control? b. Estimate the process standard deviation c. What are the limits that you would expect to contain nearly all the process measurements? 4 S 9 7 . 20 11 12 3 14 35 0.0629 0.063 0.0628 0.0634 0.0619 0.0613 0.063 00628 0,0623 0.0631 0.06.15 0.0623 0.0615 0.0645 0.0619 0.0631 0.0616 0.063 0.06.16 0.064 0.0628 0.0615 0.063 0.0635 0.0623 00636 0.0631 0.0631 0.063 0.0628 0.0629 0.0629 0.0027 0.0626 0.0631 0.061 0.063 0.0011 0.064 0.064 0.0627 0.0621 0.061 0.0631 0.0635 0.0625 0.0625 0.0032 0.0629 0.0629 0.064 0.0622 0.0631 0.0631 0.063 0.0634 0.0625 0.0622 0.0633 0.0633 00638 0.063 0.003 0.0631 0.0632 0.063 0.0631 00620 0.0629 0.0629 0.0616 0.0619 0.063 0.0635 0.063 17 10 19 21 23 24 25