Example of Hypothesis Testing Through Minitab Application in Theory of Experiment Modelling for Lean Six Sigma Project of Industrial Purpose

The way hypotheses testing is performed, is analogue to proving guilt of an accused one in the court by prosecutor. The goal of prosecutor is to prove by gathered evidences that, beyond reasonable doubt, the accused one is “guilty”. If we don’t do that, the jury will decide there are not enough evidences to sentence the accused one. Lean Six Sigma project has the same task, to prove that if we change some input “x”, the process will change and deliver different outputs “y”, and in order to do that we need to generate data before and after change of input “x” and to prove beyond any doubt (alpha risk) that change of input “x” brought to change of output “y”. All steps in hypotheses testing for Lean Six Sigma project of industrial purpose in this article are presented. During this experiment, we use Minitab as best known statistical software package for Lean Six Sigma projects through a set of programs that have been developed to carry out statistical analysis of a high degree of numerical accuracy. In this article, example of Minitab application on example of theory of experiment modelling on the influence of the impact of operating temperatures and three types of glass plates in the manufacture of the oscilloscope tube for industrial purpose is presented.