BASIC ARGUMENT MODEL
BASIC ARGUMENT MODEL
Support________________Reasoning_____________Conclusion
Evidence Warrant(s) Claim
expert testimony
statistics
examples
definition
Unstated premise(s) Judgment
Facts
Opinions General principle(s) Argument
Premises
Assumption(s) Proposition
Accepted truth/belief(s) Point
In this class, we will focus on 4 types of reasoning:
• Inductive (probability)
• Deductive (certainty)
• Cause/Effect or Causal
• Analogical or Reasoning by Analogy
Some Basic Examples of Inductive Reasoning:
The recycling program works in San Jose.
The recycling program works in Sunnyvale.
The recycling program works in Palo Alto.
Therefore, the recycling program will work in Morgan Hill.
Barry Bonds used steroids.
Mark Maquire used steroids.
John Smith used steroids.
Therefore, all major ballplayers use steroids.
Nuclear power plant A had no accidents.
Nuclear power plant B had no accidents.
Nuclear power plant C had no accidents.
Therefore, nuclear power plant D will have no accidents.
Some Basic Types of Deductive Reasoning:
• Categorical (chain argument)
A is B
C is A
Therefore, C is B
Valid (Sound) Invalid (Not sound)
All men are mortal. All men are mortal.
Socrates is a man. Socrates is mortal.
Therefore, Socrates is mortal. Therefore, Socrates is a man.
• Hypothetical Deductive Syllogisms
“If /Then” propositions
Modus Ponens: Affirming the antecedent, or “if” clause
Valid
If p, then q.
p.
Therefore, q.
If the sun is shining, then we’ll drive to the beach.
The sun is shining.
Therefore we’ll drive to the beach.
Modus Tollens: Denying the consequent, or “then” clause
Valid
If p, then q.
Not q.
Therefore, not p.
If the sun is shining, then we’ll go to the beach.
We are not going to the beach.
Therefore, the sun is not shining.
Fallacies
Invalid Denying the antecedent
If p, then q
Not p.
Therefore, not q.
If it rains, then I will carry my umbrella.
It is not raining.
Therefore, I will not carry my umbrella.
If p, then q. Affirming the consequent
q.
Therefore, p.
If the sun is shining, we will go to the beach.
We’ll go to the beach.
Therefore, the sun is shining.
• Disjunctive Deductive Syllogisms
“Either/Or” propositions
Valid
Either p or q.
Not p. Second premise denies one of the disjunctives
Therefore, q.
Either I will pass this class or I will fail.
I did not pass this class.
Therefore, I failed.
Either p or q.
Not q.
Therefore, p.
We either take the right trail or the left trail.
We will not take the left trail.
Therefore, we took the right trail.
Fallacious or Invalid
Either p or q.
p.
Therefore, not q.
Either the candidate has four years experience or a degree
The candidate has four years experience.
Therefore, the candidate does not have a degree.
(Can’t assume there’s no degree.)
Examples of Causal Reasoning
Walking through poison oak causes a rash.
Exercise lowers heart disease.
Indiscriminate sex increases STD’s.
Smoking increases chances of lung cancer.
Examples of Analogical Reasoning
The war in Iraq is like the Viet Nam war.
A game of football is like war.
A company is like a family.
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