Explanation : A definitive conclusion is given decisively, with confidence and authority; and without any ambiguity, vagueness or uncertainty. This is possible only when there is definitive evidence to support the conclusion reached. So, Assertion (A) is false. A statistical test of significance is a formal procedure for comparing observed data with the hypothesis, to verify whether it is true. It helps the researcher in drawing logically correct inferences from the data. So, Reason (R) is true.