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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