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Continual Improvement Process by V. Narayana, N. S. Sreenivasan

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CHAPTER 23

Product/Process Comparison: Statistical Tests of Significance

Scientific laws are not advanced by the principle of authority or justified by faith or medieval philosophy; statistics is the only court of appeal to new knowledge

– P. C. Mahalanobis

SYNOPSIS

Statistical test of significance is a technique of statistical analysis to know whether a certain observed result is due to ‘chance’ or any deliberate cause which one may know or one may have to find out. This is crucial to recognise the ‘cause/factor’ that led to a result and that the result was not due to chance. A general rule is specified for conducting the tests. A number of worked examples are given to illustrate the use of tests in almost all commonly encountered types of ...

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