Monday, September 23, 2013

Deductive and Inductive Reasoning


Okay. Now we're dealing with proofs. The main idea behind a proof is that you are defending an argument through sound reasoning. Watch this video detailing the two types of reasoning we engage in when trying to evidence a proof. The video explains inductive and deductive reasoning. 
Your Task:
1) Give an example of deductive reasoning with at least 3 steps (different, obviously from the video's example).
Here's mine: 
a) All crows are black 
b) The bird on my fence is a crow
c) Therefore, the bird on my fence is black
2) Then give an errant example of deductive reasoning, where there is a false conclusion.
Here's mine:
a) All Toyota cars are relatively fuel efficient
b) My car is relatively fuel efficient
c) Therefore, I drive a Toyota

Clearly, my reasoning is incorrect; I could drive a different relatively fuel efficient vehicle.
Now you go. The grade on this post is simple:
10 total points. 8 for actually posting, and 2 for commenting on another student's post as to whether you agree with his or her examples being deductive reasoning, and the errant example being indeed errant.

72 comments:

  1. Allie Nelson

    Deductive Reasoning:
    a. All U. S. bills are green.
    b. I have a U. S. dollar bill.
    c. Therefore, my dollar bill is green.
    Errant Deductive Reasoning:
    a. All American flags are red, white, and blue.
    b. X flag is red, white, and blue.
    c.Therefore, it is an American flag.

    ReplyDelete
  2. deductive reasoning
    A: Cars have four wheels
    B: I have a car
    C: Therefore my car has four wheels
    Indeductive reasoning
    A: Dogs have tails
    B: Monkeys have tails
    C: Therefore dogs are monkeys

    ReplyDelete
    Replies
    1. I agree your examples for both deductive and inductive reasoning.

      Delete
    2. Haha. I really like youre indeductive reasoning, it was very unique and funny.

      Delete
  3. Deductive Reasoning
    A: Humans have legs
    B: I have legs
    C: Therefore I am a human
    Inductive Reasoning
    A: Platypuses have a bill
    B: Ducks have a bill
    C: Therefore platypuses are ducks

    ReplyDelete
  4. Deductive reasoning
    A- All monkeys have tails
    B- There is a monkey in a tree
    C- Therefore the monkey in the tree has a tail
    Inductive Reasoning
    A- Trees have leafs
    B- I have a leaf
    C- Therefore it is from a tree

    ReplyDelete
    Replies
    1. I agree with your examples for both deductive and inductive reasoning.

      Delete
  5. Deductive Reasoning:
    A: All cats are mammals
    B: All mammals have fur
    C: Therefore all cats are mammals
    Inductive Reasoning:
    A: I drank water today
    B: I drank water yesterday
    C I drank water 2 years ago from today

    ReplyDelete
    Replies
    1. Your first one should've finished "Therefore all cats have fur"

      Delete
  6. Deductive Reasoning:
    A: All birds have wings
    B: A parrot is a bird
    C: Therefore, a parro has wings
    Inductive Reasoning
    A: People from Mexico speak Spanish
    B: My friend speaks Spanish
    C: Therefore, my friend must be from Mexico

    ReplyDelete
    Replies
    1. i like your reasons there vary unique

      Delete
    2. I agree with your idea. It's interesting.

      Delete
    3. Perfect, Ms. Treat! This is a tricky idea to put into words. Good job.

      Delete
  7. Deductive Reasoning:
    A. All fruit is healthy.
    B. Yesterday I had a piece of fruit.
    C. Therefore, I am healthy.
    Inductive Reasoning:
    A. Sports require effort.
    B. I am very good at sports.
    C. Therefore put no effort into a sport.

    ReplyDelete
  8. Bad deductive :
    1)my mom has a white nissan.
    2)Alot of cars are white
    3)all white cars are Nissan
    Good inductive.
    1)all grass is green
    2)i have grass on my lawn
    3)therefore, my lawn has green grass

    ReplyDelete
    Replies
    1. I agree with your good deductive example and that your bad deductive example is errant. Nice Job!

      Delete
    2. both examples are great

      Delete
  9. Deductive Reasoning:
    A.All puppies are cute
    B.I have a golden retriever puppy
    C. Therefore, my golden retriever puppy is cute
    Errant example of deductive reasoning:
    A.Geometry involves numbers
    B.math uses numbers
    C.Therefore, all math is geometry

    ReplyDelete
    Replies
    1. I agree with your reasoning, and it is very easy to understand, good job.

      Delete
  10. deductive reasoning
    a)all dogs have skin
    b)the animal in my back yard is a dog
    c)there for it has skin

    inductive reasoning
    a)all candy has sugar
    b)sugar is sweet
    c)there for candy is sweet

    ReplyDelete
  11. Deductive Reasoning:
    a. All computers have a keyboard
    b. I am using a computer
    c. Therefore, I am typing on a keyboard

    Indeductive Reasoning:
    a. Throughbreads are very fast
    b. I am riding a horse
    c. Therefore, I am riding a throughbread

    ReplyDelete
    Replies
    1. I think a better indeductive would be
      All throughbreds are fast
      I am riding a fast horse
      Therefore it must be a throughbred

      Delete
  12. Deductive reasoning:
    A: all apple products have an apple symbol on them
    B: I'm using an iPad
    C: therefore my iPad must have an apple symbol on it

    Inductive reasoning
    A: All apple products have a touch screen
    B: I'm using a Mac computer
    C: it must have a touch screen then

    ReplyDelete
  13. Deductive reasoning:
    A: All Dogs have four legs
    B: There is a dog on my bed upstairs
    C: Therefore it must have legs

    Inductive reasoning:
    A: all video games are fun
    B: I play video games
    C: Therefore, they must be fun!

    ReplyDelete
  14. deductive reasoning.
    all houses have roofs.
    i am in a house
    therefore, there is a roof above me.

    inductive reasoning.
    all dogs have ears
    i have ears
    therefore, i must be a dog.

    ReplyDelete
  15. Deductive reasoning:
    A. All Japanese highschool students study English.
    B. X is a highschool student and study English.
    C. Therefore X is a Japanese.

    Inductive reasoning:
    A. I am a Japanese.
    B. I like sushi.
    C. Therefore all Japanese people like sushi.

    ReplyDelete
  16. Deductive:
    Americans read comic books
    I am American
    Therefore I read comic books

    Inductive
    Horses have hooves
    Cows have hooves
    Therefore horses are cows

    ReplyDelete
  17. deductive
    beagles are dogs
    pete is a beagle
    therefore pete is a dog

    indeductive
    apples are fruit
    pears are fruit
    therefore pears are apples

    ReplyDelete
    Replies
    1. I agree with your reasoning, it is simple and to the point.

      Delete
  18. Deductive reasoning:
    a) All teams in the SEC won Saturday
    b) The Florida Gators are in the SEC
    c) Therefore the Florida Gators won Saturday
    False reasoning:
    a) All teams in the SEC won Saturday
    b) CU won Saturday
    c) CU is the the SEC

    ReplyDelete
  19. Bad
    1 In colorado there is snow
    2 there isn't snow
    3 therefor i am not in colorado
    Good
    1 humans have 2 legs
    2 i have to legs
    3 therefor i am a human

    ReplyDelete
  20. Deductive reasoning
    a) All lumberjacks have beards.
    b) The man cutting down my tree is a lumberjack
    c) therefore he must have a beard.
    False reasoning
    a) Downtown L.A. is dangerous
    b) Tigers are dangerous
    c) L.A is made of lions

    ReplyDelete
  21. Deductive Reasoning:
    a. all snow is white
    b. the ground is white
    c. there is snow on the ground
    Errant Deductive Reasoning:
    a. all dogs have four legs
    b. this animal has four legs
    c. it is a dog

    ReplyDelete
  22. Deductive Reasoning:
    a. snow is white
    b. there is white stuff on the ground
    c. it is snowing/it is snow
    Errant Deductive Reasoning:
    a. all dogs have four legs
    b. this animal has four legs
    c. it is a dog

    ReplyDelete
  23. Deductive Reasoning
    A. Milk is white
    B. My friend is drinking something white
    C. My friend is drinking milk
    False Reasonig
    A. iPhones can call
    B. My phone can call
    C. Therefore I call on an iPhone

    ReplyDelete
    Replies
    1. I think that your comment is a bit vague and I do believe that your deductive reasoning is in an indeductive form.

      Delete
    2. I think that your post is a bit vague and I do believe that your deductive reasoning is in an indeductive form.

      Delete
    3. I think that your post is a bit vague and I do believe that your deductive reasoning is in an indeductive form.

      Delete
    4. I think this may be a bit vague and the deductive reasoning is an indeductive form

      Delete
    5. This comment has been removed by the author.

      Delete
    6. This comment has been removed by the author.

      Delete
  24. deductive reasoning
    A. orange jucie is orange
    B. rachel is drinking something orange
    C.rachel is drinking orange jucie
    indiductive reasoning
    A. all cats have wiskers
    B. that has wiskers
    C. therefor thats a cat

    ReplyDelete
  25. deductive reasoning
    A. cola is black colored
    B. Sheldon is running in the dark
    C. Sheldon is running in cola
    false reasoning
    A. a squirrel has dez nuts
    B. elephants have dez nuts
    C. a squirrel is an elephant

    ReplyDelete
  26. Deductive Reasoning
    A. Apples are fruit
    B. Bananas are fruit
    C. So a banana is an apple
    Not reasoning
    A. I'm Atiba?
    B. So that means I'm Atiba!
    C. Therefore I am Judge Joe Brown.
    It all makes sense!

    ReplyDelete
  27. Deductive reasoning
    A. Halloween is in October
    B. the month is October
    C. therefore Halloween is in this month
    non reasoning
    A. my dog has four limbs
    B. my dad has four limbs
    C. therefore my dad is a dog

    ReplyDelete
  28. Deductive reasoning
    A. pencil lead can write
    B. pencil lead is in my pencil
    C.Therefore my pencil can write
    non reasoning
    A. candy is sweet
    B. soda is sweet
    C. therefore my candy is soda

    ReplyDelete
  29. deductive reasoning
    A.it takes a high gpa ato go to harvard
    B.my friend goes to harvard
    C.my friend has a high gpa
    inductive reasoning
    A.all ducks have 2 legs
    B. Mr. letter has 2 legs
    C. Mr.Letter is a duck

    ReplyDelete
  30. Deductive reasoning
    A.Film can have picture
    B.My camera has film it
    C.Therefore My camera can take pictures
    Non reasoning
    A.Rocks are hard
    B.Trees are hard
    C.Therefore trees are rocks

    ReplyDelete
  31. Deductive Reasoning
    All mammals have fur or hair
    I have hair
    therefore I am a mammal

    Inductive Reasoning
    A cat has fur
    My dog has fur
    Therefore my dog is a cat

    ReplyDelete
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    ReplyDelete
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    ReplyDelete
  34. deductive reasoning
    A. chickens have feathers
    B. birds have feathers
    C.therefore chickens are birds
    non reasoning
    A.America's flag is red, white and blue
    B.Puerto Rico's flag is red, white and blue
    C.Therefore Puerto Rico's flag is American

    ReplyDelete
  35. a. trees have bark
    b. this plant has bark
    c.therefore it is a tree

    a. all metals can be attracted to magnets
    b. this aluminum is metal
    c. there fore it is magnetic

    ReplyDelete
  36. a. soda has sugar
    b. candy has sugar
    c. therefor my soda is a candy

    a. my dad has 2 legs
    b. my parrot has 2 legs
    c. therefore my dad is a parrot

    ReplyDelete
  37. A. All cars use gas
    B. I have a car
    C. Therefore my car uses gas

    A. My dog has fur
    B. All mice have fur
    C. Therefore my dog is a mouse

    ReplyDelete
  38. a. all skateboards are made of wood
    b. i skateboard
    c.so a tree had to be cut down for me
    \
    a.i have a watch
    b.so i look at the time
    c.and now i now what time it is.

    ReplyDelete
  39. Deductive reasoning
    a. All living things use energy
    b. I use energy
    c. I am living

    inductive reasoning
    a. A turtle has eyes
    b. I have eyes
    c. I am a turtle

    ReplyDelete
  40. a.dogs have legs
    b.I have legs
    c.I am a dog

    ReplyDelete
  41. Inductive reasoning
    a. A cat has a nose
    b. I have a nose
    c. I am a cat
    Deductive reasoning
    a. All living things breathe air
    B. I breathe air
    C. I am living

    ReplyDelete
  42. Deductive:
    A. Plants use photosynthesis
    B. A rose uses photosyntheis
    C. A rose is a plant
    Inductive:
    A. My dog drinks water
    B. I drink water
    C. I am my dog

    ReplyDelete
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    ReplyDelete
  44. Deductive:
    a.paper is made out of a tree
    b. tree makes money
    c.money is a tree
    inductive
    a.my dog has a mouth
    b. i have a mouth
    c.therefore i am a dog

    ReplyDelete