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phl320 r2 critical thinking ch02b

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phl320 r2 critical thinking ch02b
Chapter Two, Part Two
BOC and IBE Reasoning

BOC REASONING
•Coming to decisions often involves weighing considerations both pro and con.
•Should I get a dog?
•There are reasons for doing so, and reasons against doing so.
•I must weigh them.

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Weighing considerations often involves both deductive and inductive reasoning.

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I shouldn’t get a dog because my landlord won’t allow it in the house and you shouldn’t get a dog if you can’t let it into the house.
Valid deductive argument!

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My landlord won’t allow a dog in the house because it says in the lease I am not permitted to have a dog. Inductive argument: conclusion is supported by premise but not proved, because landlord might make an exception.
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“Balance of Considerations” reasoning often involves both deductive and inductive reasoning. © 2012 McGraw-Hill Higher Education. All
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IBE REASONING

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Many inductive arguments involve an
Inference to the Best Explanation
(IBE).

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Why is there a hole in the garden? The best explanation is that the dog dug it. Therefore the hole probably was due to the dog’s digging it.
Why did I bomb the midterm? The best explanation is that I didn’t study hard enough. Therefore my bombing the midterm was probably due to my not studying hard enough.
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An IBE supports a conclusion, but does not prove it.
IBEs are inductive, not deductive. © 2012 McGraw-Hill Higher Education. All
Rights Reserved.

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