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PHIL102, week 1, introduction to deductive and inductive inferences

by: Angelica Li

PHIL102, week 1, introduction to deductive and inductive inferences Phil 102

Marketplace > University of Illinois at Urbana-Champaign > PHIL-Philosophy > Phil 102 > PHIL102 week 1 introduction to deductive and inductive inferences
Angelica Li
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introduction to deductive and inductive inferences
Logic and Reasoing
Timothy G McCarthy
Class Notes
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This 2 page Class Notes was uploaded by Angelica Li on Saturday April 23, 2016. The Class Notes belongs to Phil 102 at University of Illinois at Urbana-Champaign taught by Timothy G McCarthy in Spring 2016. Since its upload, it has received 7 views. For similar materials see Logic and Reasoing in PHIL-Philosophy at University of Illinois at Urbana-Champaign.

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Date Created: 04/23/16
Introduction to Deductive and Inductive Inferences Wednesday, January 20, 2016 11:28 AM Inference Argument Explain key concept Acceptable - premise makes the conclusion probable Deductive - premise guarantees conclusion Whole word problems(like hw) Inductive - iff 1 not deductive 2 probable Recognizing arguments Indicator words: signal the joint btw the premises and conclusion. e.g. therefore, hence, so, thus; since, because Incomplete arguments - Not acceptable - Missing unstated premises - Frequently generalizations Universal and statistical generalization Universal form: Every A is a B e.g. copper conducts electricity Statistical form: x% of As are Bs Example: A republican's not voting for a socialist candidate.-----> false premise ------> unacceptable Types of inductive argument - Statistical syllogism - Form e.g. x% of all As are Bs s is an A s is a B (50<x<100) - Argument based on Sample e.g. x% of observed As are Bs x% of As are Bs - Anomalies (deviation from the norm) ○ Sample size ○ Sample bias (variation) - Analogical arguments e.g. A and B are similar. A has property Q. B has property Q. Types of deductive argument - Sentential logic ○ Depend on connections btw sentences e.g. it's snowing or raining ○ Formal Sentential Validity A or B Not A B - Categorical logic ○ Depend on connections btw categories or kinds of things e.g. every platypus is a mammal some p lay eggs some mammal lay eggs ○ Formal Categorical Validity Every A is a B Some A has C Some B has C - Quantificational logic ○ Depend on the structure of relationships btw things e.g. not everyone likes Trump there's someone who doesn't ○ Formal quantificational Validity Not every A is Some A isn't Formal Validity - an argument is formally valid if it is an instance of a form that has only deductive instances Informal validity- deductive but not formally valid Phil 102 Page 1 Informal validity- deductive but not formally valid e.g. John is a bachelor John is not married Sentential Logic: Conditionals Conditional: A sentence that can be written in the form [ If A(antecedent), then C(consequent) ] Unless: P unless Q = If not P, then Q not A unless C = If A, then C Valid Conditional Forms If A, then C (affirming antecedent) - A--->C If A, then C (Denying consequent) - not C--->not A Invalid Conditional Forms If A, then C (affirming consequent) - C--X->A If A, then C (Denying antecedent) - not A--X-->not C The Material Conditional A C A -> C T T T F T T T F F F F T Phil 102 Page 2


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