Solved: The following are the numbers of defective solder joints found during successive
Chapter 16, Problem 16-28(choose chapter or problem)
The following are the numbers of defective solder joints found during successive samples of 500 solder joints: Day No. of Defectives Day No. of Defectives 1 106 12 37 2 116 13 25 3 164 14 88 4 89 15 101 5 99 16 64 6 40 17 51 7 112 18 74 8 36 19 71 9 69 20 43 10 74 21 80 11 42 (a) Using all the data, compute trial control limits for a fraction-defective control chart, construct the chart, and plot the data. (b) Determine whether the process is in statistical control. If not, assume assignable causes can be found and out-of-control points eliminated. Revise the control limits.
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