201Ex1-Fa07 - NAME Philosophy 201 - Elementary Logic Fall...

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NAME page 1 of 4 Philosophy 201 — Elementary Logic Fall 2007 Instructor: Harry Silverstein Exam #1 Informal Logic I. True or False? (2 points each) 1. An argument must have at least two premises. 2. If an argument contains no false statements, then it must be deductively valid. 3. If an argument contains no true statements, then it must be inductively weak. 4. Some deductively invalid arguments are inductively strong. 5. If a passage contains neither "premise-indicator" words nor "conclusion- indicator" words, then it cannot express an argument. 6. The passage "The Colorado Rockies are on a roll — they've won 14 of their last 15 games. Hence, the Rockies will be world champions. For 'being on a roll' is more important than any of the virtues possessed by the other teams in the playoffs" expresses an argument whose conclusion is "The Rockies will be world champions" and whose premises are "The Colorado Rockies are on a roll — they've won 14 of their last 15 games" and "'Being on a roll' is more important than any of the virtues possessed by the other teams in the playoffs." 7. Every argument whose premises describe someone's pitiful circumstances commits the fallacy of Appeal to Pity. 8. Every argument whose premises are inconsistent is deductively valid. II. For each of the following descriptions, identify the fallacy (see the list on the next page) with which it can most reasonably be associated. Give just one answer for each question. (3 points each) 9. Generalizing from a biased or unrepresentative sample. 10. Arguing that a claim is probably true because it is desirable that it be true. 11. Petitio Principii 12. Arguing that what is true of the members of a group taken individually must be true of the group taken collectively.
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201, Exam #1, Fall 2007 page 2 of 4 13. Arguing that an act is right simply because it will achieve a desirable goal. 14. Arguing that it is reasonable to believe that a claim is true because there is
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201Ex1-Fa07 - NAME Philosophy 201 - Elementary Logic Fall...

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