PHL245_Test_1_Practice_Answers

PHL245_Test_1_Practice_Answers - PHL 245 Practice Questions...

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PHL 245 Practice Questions for Test One – Answers Concepts: (1) A deductively valid argument with a false conclusion must have at least one false premise. Yes. If all the premises were true, then (since the conclusion is false) the argument would be in valid. (2) A logically inconsistent set of sentences may contain a logical falsehood . Yes. If such a set contains a logical falsehood, then it is impossible that all the members of the set be true, and so the set is inconsistent. (3) Every argument having premises that form a logically inconsistent set is deductively valid . Yes, because it is impossible for the premises to all be true and the conclusion false, simply because it is impossible for the premises to all be true. (This is a special case of validity.) (4) Logical analysis alone cannot generally tell us whether an deductively valid argument is deductively sound . True. Determining soundness involves ascertaining the truth of the premises, and this generally involves investigation of the world (unless the premises are logical truths). (5) Every argument that has “I hate everyone, but I like myself” as a conclusion is
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PHL245_Test_1_Practice_Answers - PHL 245 Practice Questions...

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