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Lecture 3

PSY 308 Lecture Notes - Lecture 3: Deductive Reasoning, Psy


Department
Psychology
Course Code
PSY 308
Professor
Dana Williams
Lecture
3

Page:
of 3


Reasoning: Drawing Deducvely Valid Conclusions
Reasoning:
Conclusion: premises
Logic: !
"#$!%$!
"%&!$&!$!
"%&!$$!$$
"$
Belief bias/conrmaon bias: $$%!%
Inducve Reasoning:
-'!(!))%
-%!
-*!+!!,))%!!
Deducve Reasoning:
-'!!,)
-*!$
Linear Ordering:
--!
-.,+/0%#12#/13
45/ 4+$0%2
-*&!+
6!###7,89
89!
:&((+,+
:&;#;<%3
0!+89
17&=+7$##!&
=
“If, Then” Reasoning/ Condional Logic/ Proposional Logic:
-0!%$! 

-8-9antecedent
-8>9consequent
-2$%8#9%!tree diagrams
Example 1: If I study, I will get good grades
0?!0+%%!
--%#-$!!!
-%!
>#-$!!!
1%!/@+
--%#-$!!!
-7!!!
>#-7%
0?!/@-
--%#-$!!!
-!!!
>#-
1%!0-
--%#-$!!!
-7%
>#-7!!!
Example 2: If gun control reduces violent crime, then people will vote for it

1%!/@+
-!#$
!!
>#!7
Example 3: If the Lakers were second, then the 76ers came rst
0?!0
-A&$#BC(
>A&$
>#BC(
-:&%&$D$8#%98#9
Negaons:
Example 1:-!!#-$!*
1%!0+
-!!#-$!*
-!!!
4%5