Inductive vs. Deductive Reasoning

Deductive Reasoning

-begins with a universal rule -goes from big to small -uses logic -can be false if begins with a false premise

Inductive or Deductive? 1:The pattern 10, 20, 30, 40, 50, can be completed by adding 10 to the last number. 2: All even numbers are divisible by 2. Twenty- eight is even; therefore 28 is divisible by 2. 3: Jimmy got bitten by a dog. Jimmy is now scared of all dogs. 4: Two episodes of The Big Bang Theory made me laugh and laugh and laugh. Therefore, The Big Bang Theoryis always funny.

1: deductive ??? 2: deductive 3: inductive 4: inductive

Inductive Reasoning

-ends with a universal rule -goes from small to big -uses observation -can be false b/c exceptions exist

Inductive or Deductive? 1: Since Chris is a good athlete, Chris's sister must be a good athlete also. 2: Most universities and colleges in Kentucky ban alcohol from campus. Therefore, most universities and colleges in the U.S. ban alcohol from campus. 3: Every cat on my street is black, therefore all cats are black. 4: Every Assumption girl I have met wears a headband; therefore headbands must be part of the Assumption uniform. 5: All athletes work out in a gym. Tim Tebow is an athlete; therefore Tebow works out in a gym.

1: deductive ?? 2: inductive 3: inductive 4: inductive 5: deductive

Inductive or Deductive? 1: Since all squares are rectangles, and all rectangles have four sides, all squares have four sides. 2:All chemists are smart, since chemists are scientists and all scientists are smart. 3: Every dog I have ever known eats meat; therefore all dogs eat meat. 4: All swans we have seen have been white; therefore the next swan we see will be white. 5: All known planets travel about the sun in elliptical orbits; therefore all planets travel about the sun in elliptical orbits.

1: inductive ???? 2: deductive 3:inductive 4: deductive ??? 5: inductive

Inductive or Deductive? 2: All cats have fur. Xenais a cat. Therefore, Xena has fur. 3: All humans have a nose. Bobby is human. Therefore, Bobby has a nose. 4: Tom and Larry are shouting and waving their arms about. Therefore, Tom and Larry must be angry. 5: My math teacher is skinny. My last math teacher was skinny. All math teachers are skinny.

2: deductive 3: deductive 4: inductive??? 5: inductive

Inductive or Deductive? 1. All rabbits are vegetarians. Chocolate is a rabbit, therefore Chocolate is a vegetarian. 2. All dogs have fleas. Hagridis a dog. Therefore, Hagridhas fleas. 3. All men are mortal. Joe is a man. Therefore Joe is mortal. 4. Bachelors are unmarried men. Bill is unmarried. Therefore, Bill is a bachelor. 5. All cats are mammals. All mammals have kidneys. Therefore all cats have kidneys.

1: Deductive 2: deductive 3: deductive 4: deductive 5: inductive ???