Unit 7 Homework S6.25 - Sample number 3 is the only sample...

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PROBLEM S6.25 a) Sample Number Number of Incorrect Bills Fraction Deffective Process in or out of control? 1 6 0.120 In Control 2 5 0.100 In Control 3 11 0.220 Out of Control 4 4 0.080 In Control 5 0 0.000 In Control 6 5 0.100 In Control 7 3 0.060 In Control 8 4 0.080 In Control 9 7 0.140 In Control 10 2 0.040 In Control Totals 47 0.940 P-bar = 47 / (50(10)) = 0.094 Stand deviation = square root (0.094(1-0.094) / 50) = 0.041 UCL = 0.094 + (3)(0.041) = 0.217 LCL = 0.094 - (3)(0.041) =
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Unformatted text preview: Sample number 3 is the only sample out of control, as it's fracTon defecTve value of 0.220 exceeds the upper control limit of 0.217. b) Using a Pareto Chart, we could show which types of errors occurred most frequently allowing us to decide where to apply iniTal eFort for maximum eFect. ±his method allows one to eliminate the biggest causes ²rst....
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