Deductive vs. Deductive vs. InductiveInductiveReasoningReasoning

Which one is it?Which one is it?

Everything made of copper Everything made of copper conducts electricity.conducts electricity.

This wire is made of This wire is made of copper.copper.

This wire will conduct This wire will conduct electricityelectricity

DEDUCTIVE!!!DEDUCTIVE!!!

Tristan owns only blue Tristan owns only blue pants and brown pants.pants and brown pants.

Tristan is wearing a pair Tristan is wearing a pair of pants today.of pants today.

So, Tristan is wearing So, Tristan is wearing either blue or brown either blue or brown pants today.pants today.

DEDUCTIVE!!!DEDUCTIVE!!!

All sheep that All sheep that I’ve seen are I’ve seen are white.white.All sheep must All sheep must be white.be white.

INDUCTIVE!!!INDUCTIVE!!!

Socrates was Greek.Socrates was Greek.

Most Greeks eat fish.Most Greeks eat fish.

Socrates probably ate Socrates probably ate fish.fish.

The soccer game is on The soccer game is on Thursday or Friday.Thursday or Friday.

I just found out that the I just found out that the game is not on Thursday, game is not on Thursday, so the game must be on so the game must be on __________.__________.

January has always January has always been cold here in been cold here in Siberia.Siberia.

Today is January 14Today is January 14thth, , so it is going to be so it is going to be another cold day in another cold day in Siberia.Siberia.

The local branch of Wachovia Bank The local branch of Wachovia Bank was robbed yesterday.was robbed yesterday.Hannah needed money to pay off Hannah needed money to pay off her gambling depts. her gambling depts. She just bought a gun two days She just bought a gun two days ago, and I saw her hanging around ago, and I saw her hanging around the bank yesterday morning.the bank yesterday morning.Today the bookie’s goons stopped Today the bookie’s goons stopped looking for Hannah.looking for Hannah.So, Hannah robbed Wachovia Bank So, Hannah robbed Wachovia Bank yesterday.yesterday.

All turtles have shells.All turtles have shells.

The animal I have The animal I have captured is a turtle.captured is a turtle.

I conclude that the I conclude that the animal in my bag has a animal in my bag has a shell.shell.

Austin: Jalen, look up. What do Austin: Jalen, look up. What do you see?you see?Jalen: I see thousands of stars.Jalen: I see thousands of stars.Austin: And what does that Austin: And what does that mean to you?mean to you?Jalen: I guess it means we will Jalen: I guess it means we will have another nice day have another nice day tomorrow. What does it mean tomorrow. What does it mean to you?to you?Austin: To me, it means Austin: To me, it means someone has stolen our tent.someone has stolen our tent.

Photo A taken indoors Photo A taken indoors without a flash did not without a flash did not come out.come out.Photo B taken indoors Photo B taken indoors without a flash did not without a flash did not come out.come out.Photo C taken indoors Photo C taken indoors without a flash did not without a flash did not come out.come out.Photos taken indoors Photos taken indoors without a flash will not without a flash will not come out.come out.

All 8All 8thth graders must graders must take science.take science.

John is an 8John is an 8thth grader.grader.

John must take John must take science.science.

Frogs are amphibians.Frogs are amphibians.

The coqui is a frog The coqui is a frog native to Puerto Rico.native to Puerto Rico.

The coqui is an The coqui is an amphibian.amphibian.

Murphy is a dog.Murphy is a dog.

All dogs can bark.All dogs can bark.

Murphy can bark.Murphy can bark.

Young children read Young children read comic strips.comic strips.Teenagers read comic Teenagers read comic strips.strips.Adults read comic Adults read comic strips.strips.Conclusion: ?Conclusion: ?Which type of Which type of reasoning?reasoning?

Russell enjoys snow Russell enjoys snow skiing.skiing.Russell enjoys ice-Russell enjoys ice-skating.skating.Russell enjoys Russell enjoys bobsledding.bobsledding.Russell enjoys ice Russell enjoys ice hockey.hockey.Conclusion: ?Conclusion: ?Which type of reasoning?Which type of reasoning?

Jesus is fluent in Spanish.Jesus is fluent in Spanish.Jesus speaks German like a Jesus speaks German like a native.native.Jesus reads French Jesus reads French newspapers.newspapers.Conclusion: ?Conclusion: ?Which type of reasoning?Which type of reasoning?

All lawyers must pass All lawyers must pass a bar exam.a bar exam.

Sheldon is a lawyer.Sheldon is a lawyer.

Sheldon passed the Sheldon passed the bar exam.bar exam.

The beach roads are The beach roads are jammed with traffic every jammed with traffic every Memorial Day.Memorial Day.The beach road are jammed The beach road are jammed with traffic every July 4with traffic every July 4thth..The beach roads are The beach roads are jammed with traffic every jammed with traffic every Labor Day.Labor Day.Conclusion: ?Conclusion: ?Which type of reasoning?Which type of reasoning?

Sydney is allergic to all Sydney is allergic to all foods containing foods containing wheat.wheat.

Spaghetti contains Spaghetti contains wheat.wheat.

Sydney is allergic to Sydney is allergic to spaghetti.spaghetti.