A cell phone company wants to determine if the use of text messaging is independent of age.The following data has been collected from a random sample of customers. 
To conduct a contingency analysis,the number of degrees of freedom is:
Definitions:
Subject
In philosophy, it refers to the entity that is the observer or experiencer of perceptions and thoughts.
Predicate
A grammatical and logical term that refers to the part of a sentence or an expression that states something about the subject.
Propositions
Statements or assertions expressing judgments or opinions that can be either true or false.
True
Corresponding to reality or fact; not false.
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