# A Closer Look at Inductive vs. Deductive Reasoning - PowerPoint PPT Presentation

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## A Closer Look at Inductive vs. Deductive Reasoning

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### A Closer Look at Inductive vs. Deductive Reasoning Deductive vs. Inductive Reasoning The difference: inductive reasoning uses patterns to arrive at a conclusion ... – PowerPoint PPT presentation

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Title: A Closer Look at Inductive vs. Deductive Reasoning

1
A Closer Look at Inductive vs. Deductive Reasoning
2
Deductive vs. Inductive Reasoning
• The difference
• inductive reasoning uses patterns to arrive at a
conclusion (conjecture)
• deductive reasoning uses facts, rules,
definitions or properties to arrive at a
conclusion.

3
• Inductive reasoning - Think of it like a
• Deductive reasoning think of it like a

4
Examples of Inductive Reasoning
• Some examples
• Every quiz has been easy. Therefore, the test
will be easy.
• The teacher used PowerPoint in the last few
classes. Therefore, the teacher will use
PowerPoint tomorrow.
• Every fall there have been hurricanes in the
tropics. Therefore, there will be hurricanes in
the tropics this coming fall.

5
Deductive Reasoning
An Example
You are an entering freshman.
Conclusion You will have to take a mathematics
placement test.
6
Inductive or Deductive Reasoning?
• Geometry example

What is the measure of angle x?
Triangle sum property - the sum of the angles of
any triangle is always 180 degrees. Therefore,
angle x 30
7
Inductive or Deductive Reasoning?
• Geometry example

What is the next shape in the sequence?
8
• 90 of humans are right handed. Joe is human,
therefore Joe is right handed.

DEDUCTIVE
9
You are a good student. You get all As Therefore
your friends must get all As too
INDUCTIVE
10
All oranges are fruits. All fruits grow on
trees Therefore, all oranges grow on trees
DEDUCTIVE
11
• Mikhail hails from Russia and Russians are tall,
therefore Mikhail is tall

INDUCTIVE
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