Facts are agreed-upon statements; theories are ideas.
A theory not only explains known facts; it also allows scientists to make predictions of what they should observe if a theory is true. Scientific theories are testable. New evidence should be compatible with a theory. If it isn't, the theory is refined or rejected.
A theoretical statement says something about the values of one or more variables, although it is generally thought of as expressing something about the relationship between two or more variables (e.g., “The more television a child sees, the more aggressive the child will act”).
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