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The Role of Theory in Quantitative ResearchA quantitative research is an investigation that is testing a theory made up of variables, measured and analysed with numbers using statistical procedures to determine how true the generalization of the theory is (Saunders et al., 2015). According to Kerlinger (1979) a theory is a set of interrelated variables that represents an organized observation of a phenomenon by showing the relationship between the variables. Saunders (2015) poised that a quantitative study uses the deductive method to test and verify the theory which serves as the framework of the study rather than developing it. This happens when the researcher investigates the hypothesis derived from the theory to verify the generalization of the theory (Saunders et al., 2015). A deductive approach gives details of the relationship between the theory and the variables. It also gives the choice of measuring a concept quantitatively.The Central Role of a Theory in Deductive ReasoningThe deductive reasoning begins with setting the theory as the framework for the study, forming hypotheses from the theory, and collecting and analyzing data to test the formed hypotheses (Creswell & Plano Clark, 2007). Deductive reasoning is always reasoning from specifics to generals. Research as explained earlier is based on deducing the variables from thetheory or theories before the test are conducted. Hence a theory explains in detail the context of the study of which the theory is the origin of the study in all perspective. In my doctoral study case the hypothesis of the study is developed based on an existing theory - leader-member exchange (LMX) theory. The LMX theory has been used as a theory and serves as a base for the study and has a major impact on how the study has been developed. After which the research strategy is designed and the hypothesis will tested to prove the theory is true.