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Psych Research Pt 2

Propositional Logic Forms of Arguments

TermDefinition
Affirming the Consequent If P is true, then Q is true. Q is true, therefore P is true.
Is Affirming the Consequent valid? No; it is logically impossible to ever prove that a theory is completely true.
Is Affirming the Consequent useful to science? Sort of; a correct prediction can increase our belief in the theory.
Modus Tollens If P is true, then Q is true. Q is not true, so P is not true.
Is Modus Tollens valid? Yes.
Is Modus Tollens useful to science? Yes; science works by using modus tollens to prove theories false.
Modus Ponens If P, then Q. P is true, therefore Q is true.
Is Modus Ponens valid? Yes.
Is Modus Ponens useful to science? No; it assumes the theory is true, which we don't know.
Created by: 2144066352316258
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