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anonymous

  • one year ago

Is there another way to think through conditional probabilities without using a tree diagram?

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  1. anonymous
    • one year ago
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    When you say "think through", do you mean working out a specific exercise or understanding what conditional probabilities generally mean?

  2. anonymous
    • one year ago
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    (I think I can help you in both cases!)

  3. anonymous
    • one year ago
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    yes working out a specific excercise !?

  4. anonymous
    • one year ago
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    ?? help

  5. anonymous
    • one year ago
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    Okay there's a formula for the conditional probability, which is P(A|B) = P(A and B)/P(B)

  6. anonymous
    • one year ago
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    Have you seen that before?

  7. anonymous
    • one year ago
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    yes!

  8. anonymous
    • one year ago
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    Okay, cool! Would you like me to take you through a specific example to see how it works, or does that sort out your problem?

  9. anonymous
    • one year ago
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    no I was just wondering if there was another way besides using that formula ? But if you want to show me an example that would be great too :)

  10. anonymous
    • one year ago
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    I can draw a picture, if it helps.

  11. Hero
    • one year ago
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    post the conditional probability problem you are working on and we can work through it.

  12. anonymous
    • one year ago
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    |dw:1442528356799:dw|

  13. anonymous
    • one year ago
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    P(A|B) means that you know for sure that B has happened, and you want to know the chance of A happening now.

  14. anonymous
    • one year ago
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    If B has already happened, then you know that you're somewhere inside the circle on the right (in my drawing). To find the probability of A also happening, you need to see how big the area marked "A and B" is compared to the whole of the circle B.

  15. anonymous
    • one year ago
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    That's why you get the formula P(A and B) / P(B).

  16. anonymous
    • one year ago
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    Perfect! I think I understand it better haha. My professors sucks, but have a great day guys!

  17. anonymous
    • one year ago
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    You too :)

  18. Hero
    • one year ago
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    Great job of explaining things @BasketWeave

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