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Lecture 17

MODR 1730 Lecture Notes - Lecture 17: Logical Reasoning

Modes Of Reasoning
Course Code
MODR 1730
Shawn Thompson

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Good and BAD arguments
-Good can be sound and cogent (sound-deductive form is valid and
premise is true Cogent-inductive applies to inductive strong and
premise to be true or very likely to be true)
ex. All cats are green
You have a cat
Your cat is green
(Deductive, and valid)
All cats are green
You have a dog
Your dog is green
(Deductive and invalid)
All cats have eyes
You have a dog
Your dog is has eyes
(True P and conclusion but invalid because it is missing form)
-Bad is unsound or lacks cogency
(Form is invalid, going to be unsound)
Weak and Strong Argument
Little evidence is weak; a lot of evidence is strong
Most times, Science uses induction. (Process of building inductive
Empirical-physical evidence (you can sense it)
For inductive, ask your how much evidence do THESE premises provide
for THIS conclusion?
Inductive- Strong or Weak? <--- Form/Structure
Deductive- Valid or Invalid?
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