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Case uitwerking Inleiding Tot Informatica En Supply Chain Management
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Oplossingen in Excel file over de statistical quality control oefeningen gegeven door Johan Devos.
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, Samples of part diameter in inches1 2 3 4 n:
5.8 6.2 6.1 6 Number of samples 4
5.9 6 5.9 5.9 Number of observations per sample 4
6 5.9 6 5.9
6.1 5.9 5.8 6.1
Mean 5.95 6.00 5.95 5.98
Overall mean 5.97
Computatations for x-Bar chart
Overall mean 5.97
Standard deviation 0.113835 inches
Standard deviation of the mean 0.056917 SD delen door wortel van 4
Z-value for control chart 3
Center line 5.97
UCL 5.80
LCL 6.14
Deze controlegrenzen vormen de grenzen waarin 99,74% van de output van die machine gaat inzitten.
De sample means lopen mooi tussen de controlegrenzen, dus de processen zijn in controle.
, Observations Number of samples 10
Number of observations 4
Sample 1 2 3 4 Mean Range
1 16.40 16.11 15.90 15.78 16.05 0.62
2 15.97 16.10 16.20 15.81 16.02 0.39
3 15.91 16.00 16.04 15.92 15.97 0.13
4 16.20 16.21 15.93 15.95 16.07 0.28
5 15.87 16.21 16.34 16.43 16.21 0.56
6 15.43 15.49 15.55 15.92 15.60 0.49
7 16.43 16.21 15.99 16.00 16.16 0.44
8 15.50 15.92 16.12 16.02 15.89 0.62
9 16.13 16.21 16.05 16.01 16.10 0.20
10 15.68 16.43 16.20 15.97 16.07 0.75
16.01 0.45
Overall mean: 16.01
Range (spreiding) 0.45
Factor afhankelijk van Q observaties
LCL en UCL obv de mean
Center line: 16.01
Factor voor x chart (A2) 0.73 Zie grafiek
LCL: 15.69 15,69-16,34 CL
UCL: 16.34 15,7-16,3 SL
Proces voldoet niet echt aan design standards, dus toch iets moeten doen (zie opdracht)
LCL en UCL obv de range
Center line: 0.45
Factor voor R chart
D3 0.00
D4 2.28
LCL: 0
UCL: 1.02
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