Examples Common cause and special cause (statistics)

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common causes

inappropriate procedures
poor design
poor maintenance of machines
lack of defined standard operating procedures
poor working conditions, e.g. lighting, noise, dirt, temperature, ventilation
substandard raw materials
measurement error
quality control error
vibration in industrial processes
ambient temperature , humidity
normal wear , tear
variability in settings
computer response time

special causes

poor adjustment of equipment...
operator falls asleep
faulty controllers
machine malfunction
fall of ground
computer crash
poor batch of raw material
power surges
high healthcare demand elderly people
broken part
lack of awareness
abnormal traffic (click fraud) on web ads
extremely long lab testing turnover time due switching new computer system
operator absent




^ statistical inference . archived original on 7 october 2006. retrieved 13 november 2006. 






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