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Theoretical Statements Relating Two Variables
Theoretical statements relating two variables

We said in the previous chapter that a hypothesis must be made up of at least two variables; a hypothesis expresses the relationship between two or more variables. We also referred to assumptions and propositions. In this chapter, we look at the relations between two variables more closely and distinguish among several types of theoretical statements.

Hage (1972) suggested that the term theoretical statement be used to describe more broadly the relationship between variables, encompassing such terms as assumption, hypothesis, postulate, proposition, theorem, and axiom. In this book, we will use three of the more specific terms—assumption, hypothesis, and proposition—with theoretical statement being used generally to describe all three.

A theoretical statement says something about the values of ...

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