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1-27-11 - Evaluating Arguments(Terminology o Deductive...

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1-27-11 Evaluating Arguments (Terminology) o Deductive arguments o Valid o Invalid o Sound o Unsound o Propositions o True o False o Probably/ improbable o Possible/ impossible Example of a Valid Argument 1) If my car runs, then my car has gas 2) My Car runs C) Therefore, my car has gas Example of an Invalid Argument 1) If my car runs, then my car has gas 2) My car has gas C) Therefore, my car runs Deductive Validity o An argument is deductively valid if and only if it is impossible for all of the premises to be true and for conclusion to be false o An argument is deductively valid if and only if the conclusion is true if all of the premises are true Judging Validity o We judge validity by attempting to imagine scenarios where all of the premises are true but where the conclusion is false Test Case 1) Birds swim and fish fly C) Birds swim Test Case 1) If you don’t study today, you wont study tomorrow
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