Inductive/Dedu ctive Reasoning Using reasoning in math and science
Inductive Reasoning Process of reasoning that a rule or statement is true based on a pattern. You can draw a conclusion from a pattern called a Conjecture. A Conjecture is a statement you believe to be true based on inductive reasoning.
Example The product of an even number and an odd number is _______ List some examples and look for a pattern 2(3)= 62(5)=10 4(3)=12 Product of even and odd number is ____
Counterexample To show a conjecture is always true, you have to prove it. To show that a conjecture is false, you only have to find one example in which the conjecture isn’t true. This is called the Counterexample
Examples Every pair of supplementary angles includes one obtuse angle. Is there a counterexample that disproves this statement?
Conditional Statements Can be written in the form p q An “if then” statements The Hypothesis is followed by “if” The conclusion is followed by “then”
Example Hypothesis: A number is an integer. It is a natural number. If a number is an integer, Then it is a natural number. Analyze the truth value of the statement. Is the hypothesis always true? Can you find a counterexample to disprove it?
Related Conditionals Hypothesis – P q Converse- flipping hypothesis and conclusion q p Inverse- Negate the hypothesis and conclusion -p -q Contrapositive – switch and negate hypothesis and conclusion -q -p
Truth Value Need to test the truth value of all statements. Example: If I have a cold then I am sick. If I’m sick then I have a cold If I don’t have a cold then I’m not sick If I’m not sick then I don’t have a cold.