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← Deductive reasoning - Intro to Psychology

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Showing Revision 2 created 05/25/2016 by Udacity Robot.

  1. So let's look at an example of deductive reasoning. So Premise A, is all mass
  2. creates gravity. And Premise B, is all objects have mass. Therefore, all
  3. objects create gravity. Because if all mass has gravity and all objects have
  4. mass, then they must create gravity. Notice that the logical conclusion has to
  5. be true if the 2 premises are true. We know, however, that this type of
  6. reasoning can lead to correct conclusions only when the general premises to
  7. which they are based are true. Let's look at another example. Premise A,is I
  8. don't know math. Premise B is, I can't learn math. Therefore, I shouldn't even
  9. bother trying to learn math". We see, here, that this reasoning leads to a
  10. false conclusion, because premise A is false. And so is premise B. So, even
  11. though the argument is. Easily structured in the same way. One leads to an
  12. accurate conclusion, and one, this one, does not. Deductive reasoning is what
  13. scientists use when we make predictions for our general goals. Now let's go to
  14. Susan and talk about inductive reasoning.