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Lesson 9: Fallacies
SOCI 108 - Thinking Critically about Social IssuesSpring 2012
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Learning Outcomes
Define Fallacy Identify common fallacies
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What a Fallacy
A fallacy is a mistake in reasoning A fallacious argument is one that contains a
mistake in reasoning If an argument exhibits a fallacy, it is
probably a bad argument, but not always
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Fallacies of Relevance
The statements are not relevant to the conclusion.– What’s that got to do with the price of tea in
China?
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Fallacies of Insufficient Evidence
The statements don’t provide enough evidence The statements don’t provide the right kind of evidence, not
weighty enough– My brother said versus an expert said
Consider the source– Dr. Phil’s diet
Do you question the source’s observations/is the source generally reliable?
– Enquirer vs The New York Times Did the person making the argument understand and cite the
original source correctly? Is there a conflict with other experts?
– Smoking pot
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Fallacies of Ambiguity
Ambiguous language or poor grammatical structure so you can’t follow
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