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Standardizing Arguments. Premise 1: New Mexico offers many outdoor activities. Premise 2: New Mexico has rich history of Native Americans and of Spanish conquest Premise 3: New Mexico is inexpensive. _______________________________
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Standardizing Arguments • Premise 1: New Mexico offers many outdoor activities. • Premise 2: New Mexico has rich history of Native Americans and of Spanish conquest • Premise 3: New Mexico is inexpensive. _______________________________ • Conclusion: New Mexico is an excellent vacation choice.
Standardizing Arguments • Claim: New Mexico is an excellent vacation choice. ______________________________________ • Support/Evidence 1: New Mexico offers many outdoor activities. • Support/Evidence 2: New Mexico has rich history of Native Americans and Spanish conquest • Support/Evidence 3: New Mexico is inexpensive.
Standardizing Arguments with the Toulmin Model Premises(Grounds)→→→Conclusion (Claim) REASONING (WARRANT) G → So C; SinceW Harry was born in the U.S. (Grounds) → So: Harry is a U.S. citizen (Claim) SinceA person born in the U.S. is legally a U.S. citizen (Warrant)
Toulmin Model, cont. (G) Harry was born in the U.S. →So: (Q) presumably, (C) Harry is a U.S. citizen (R) unless he did not claim the U.S. citizenship Since (W) A person born in the U.S.is legally a U.S. citizen On account of (B) U.S. immigration law
Main Types of Reasoning • INDUCTIVE: forming generalizations from specific instances • DEDUCTIVE: reasoning from principles (known facts) • CAUSAL reasoning • PARALLEL CASE
Inductive Reasoning • Reasoning that moves from particular facts to a general conclusion.
Guidelines for Inductive Reasoning • Are there enough specific instances? • Are the specific instances typical? • Are the instances recent / relevant?
Deductive Reasoning • Reasoning that moves from a general principle to a specific conclusion. • The conclusion of deductive reasoning is certain rather than probable.
Syllogisms • Major Premise: All humans are mortal • Minor Premise: Socrates is a human Therefore: • Conclusion: Socrates is mortal
Guidelines for Deductive Reasoning • Make sure listeners will accept your general principle (major premise) • Provide evidence to support your minor premise
Causal Reasoning • Reasoning that seeks to establish causal relationship between two phenomena / events. • A causes B
Guidelines for Causal Reasoning • Avoid the fallacy of false cause • Do not assume that events have only a single cause
Parallel cases Reasoning • Reasoning in which a speaker compares two similar cases and infers that what is true for the first case is also true for the second.
Guidelines for Parallel Cases Reasoning • Above all, make sure the two cases being compared are essentially alike
Fallacy • An error in reasoning.
Fallacies • Hasty generalization • Causal Fallacies (False cause) • Bandwagon Fallacy • Ad Hominem • Either / Or Fallacy • Invalid analogy • Appeals to Misplaced Authority, Ignorance, Emotion, Tradition
Hasty Generalization • A fallacy in which a speaker jumps to a general conclusion on the basis of insufficient evidence.
False Cause • A fallacy in which a speaker mistakenly assumes that because one event follows another, the first event is the cause of the second.
Invalid Analogy • An analogy in which the two cases being compared are not essentially alike.
Red Herring • A fallacy that introduces an irrelevant issue to divert attention from the subject under discussion.
Red Herring • “Why should we worry about the amount of violence on television when thousands of people are killed in automobile accidents each year?”
Ad Hominem • A fallacy that attacks the person rather than dealing with the real issue in dispute.
Ad Hominem • “The governor has a number of interesting economic proposals, but let’s not forget that she comes from a very wealthy family.”
Either-Or • A fallacy that forces listeners to choose between two alternatives when more than two alternatives exist.
Either-Or • “The government must either raise taxes or reduce services for the poor.”
Bandwagon • A fallacy that assumes that because something is popular, it is therefore good, correct, or desirable.
Bandwagon • “The President must be correct in his approach to domestic policy; after all, polls show that 60 percent of the people support him.”
Slippery Slope • A fallacy that assumes that taking a first step will lead to subsequent steps that cannot be prevented.
Slippery Slope • “Passing federal laws to control the amount of violence on television is the first step in a process that will result in absolute government control of the media and total censorship over all forms of artistic expression.”