chapter 1

Chapter 16: Quality Control Methods41.ixisiri1 50.83 1.172 2.22 50.10 .854 1.73 50.30 1.136 2.14 50.23 1.097 2.15 50.33 .666 1.36 51.20 .854 1.77 50.17 .416 .88 50.70 .964 1.89 49.93 1.159 2.110 49.97 .473 .911 50.13 .698 .912 49.33 .833 1.613 50.23 .839 1.514 50.33 .404 .815 49.30 .265 .516 49.90 .854 1.717 50.40 .781 1.418 49.37 .902 1.819 49.87 .643 1.220 50.00 .794 1.521 50.80 2.931 5.622 50.43 .971 1.9s = 19.706 , s = . 8957 , Σx i=1103. 85 , x = 50. 175 , a = . 3886Σ ichart has LCL = 0 and UCL =s = 2. 931 > UCL( ) 1 − (.886)3 .8957.8957 + = 2.3020 , and.8862, from which an s21. Since an assignable cause is assumed to have been identified weeliminate the 21 st group. Then = 16. 775x = 50. . The resultings , s = . 7998 , 145Σ iUCL for an s chart is 2.0529, and < 2. 0529s has limitssifor every remaining i. The x chart based on3 (.7988)50 .145 ± = 48.58,51.71. Alli.886 3x values are between these limits.481