Chapter 2.1 and 2.4 Inductive Reasoning and Conjecture and Deductive Reasoning.
Chapter 6 Reasoning Errors
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Transcript of Chapter 6 Reasoning Errors
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Chapter 6 Reasoning Errors
This chapter will cover
• Fallacies (errors in reasoning)
• Fallacies that lead listeners away from the real issue
• Useful approaches for handling fallacies
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Reasoning Errors
Fallacies - 2 kinds
• Inadequate Reasons
• Fallacies that Mislead
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Fallacies
Inadequate Reasoning
• Sounds good • Sounds logical• However, does not provide adequate support• Form but no substance
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Inadequate Reasons
Faulty Analogies
• Significant differences between compared items.
– Compare a product to an experience– Compare current experience to past– Advice for them will work for you
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Inadequate Reasons
False Cause – Post Hoc
• Post Hoc Ergo Propter Hoc: “After this, therefore because of this
– First event causes second event without reason– Superstitious reasoning– Blame game
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Inadequate Reasons
The Slippery Slope
• Consequences of potential action predicted but not supported
– The domino effect– Prediction based on speculation
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Inadequate Reasons
The Straw Man
• Opponent’s argument distorted or exaggerated and then easily attacked.
– Position argument at extreme
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Inadequate Reasons
Hasty Conclusion
• Generalize with little information
– Jumping to conclusions– Rushing to judgment– Self-fulfilling prophecy
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Inadequate Reasons
The False Dilemma
• Presenting only two extreme alternatives
– No possibilities in between– Leads to simplistic solutions
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Inadequate Reasons
Begging the Question
• Speaker assumes what needs to be proven
– Places the burden of proof on the listener – Builds on an unproven assumption – Uses a ‘loaded question’
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Skill Recognize when reasons given to justify a
conclusion are not sufficient.
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Fallacies
Fallacies that mislead
• Reasons that lead the listener away from the primary issue.
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Fallacies That Mislead
The Red Herring
• Distract your attention • Put on the defensive with another issue.
– Get that stick out of here• It’s not a stick. It’s a laser beam
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Fallacies That Mislead
Ad Hominem: Attacking the person
• Attack personal qualities instead of the issue
– Thomas Jefferson called “anti-American”– John Adams was accused of being a ‘fool’– Used to discredit someone
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Fallacies That Mislead
Ad Populum:
• Jumping on the bandwagon• If everyone is doing it, then it is okay
– Keeping up with the Jones– The in-crowd– Why we buy products
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Fallacies That Mislead
Appeal to Traditions
• Conform to tradition• “We’ve always done it this way”• Reasons are not relevant to the claim
– All the men in our family have been lawyers
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Fallacies That Mislead
Appeal to Pity
• Follow a course of action due to compassion• May be true but is irrelevant to the claim
– You should go out with me or I will be upset
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Fallacies That Mislead
Equivocation
• The same word - two different meanings
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Chapter 6 Reasoning Errors
Checkup
• Fallacies that mislead versus fallacies with insufficient support
• What makes an analogy faulty?