Six Sigma SPC OEM Products
Six Sigma and SPC (Statistical Process Control) Software
Six Sigma SPC - 2070 W. Washington St. #5
Springfield IL 62702 Ph: 217.698.0063
6 Sigma Statistical Process Control (SPC) Software for Windows
Technique that insures each item in a sample
for inspection is selected
completely by chance to be measured.
You should never do 100% inspection in any six
sigma quality plan.
Sampling is more accurate in statistical
process control for several reasons including it is less susceptible
for ‘inspection fatigue’ in a process, because
there is a lesser chance for errors. Products that are 100%
inspected sometimes are found to have a astounding number of defects.
Famous errors and lessons learned in random
sampling can be attributed to Literary Digest magazine in 1936. They took
a random sample from the telephone listings for a pre-election poll. The
10 million samples taken during the depression years were not accurate
because in 1936 the people who could afford a phone and magazine
subscription did not constitute a random sample. The company was soon out