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anonymous

  • one year ago

Help with probability?

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  1. anonymous
    • one year ago
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    @uri @perl @ganeshie8

  2. anonymous
    • one year ago
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    I will help :) What's the problem

  3. anonymous
    • one year ago
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    Choose a row and column and compare P(A | B) with P(B | A). Explain what each probability means in the context of the situation and data you collected.:

  4. undeadknight26
    • one year ago
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    Alright do you know how to find the probability of this? Or is that what you need help with?

  5. anonymous
    • one year ago
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    I'm just kinda lost on what column to choose.

  6. anonymous
    • one year ago
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    And where to go from there.

  7. undeadknight26
    • one year ago
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    Choose any one

  8. anonymous
    • one year ago
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    Okay, how about Nikon professional photographers to Canon professional photographers?

  9. anonymous
    • one year ago
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    @undeadknight26

  10. undeadknight26
    • one year ago
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    One second please :)

  11. anonymous
    • one year ago
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    Okay, sorry!

  12. undeadknight26
    • one year ago
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    It's fine m8 :)

  13. undeadknight26
    • one year ago
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    I'm just refreshing my memory on probability lol

  14. undeadknight26
    • one year ago
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    Well you chose the Professional column right?

  15. anonymous
    • one year ago
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    Yes!

  16. undeadknight26
    • one year ago
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    This question is busting my brain ._. @acxbox22 @surjithayer @sleepyjess @dan815 @geny55 @gabylovesu @campbell_st @Nurali @robtobey

  17. undeadknight26
    • one year ago
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    Sorry mate I thought I could do it but I forgot everything about probability :/

  18. perl
    • one year ago
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    Would you like help with this?

  19. anonymous
    • one year ago
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    Yes please!

  20. perl
    • one year ago
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    you want to compare P(A|B) and P(B|A) First lets define A and B

  21. anonymous
    • one year ago
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    Okay, how?

  22. perl
    • one year ago
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    Let A = professional B = Nikon brand Once you define A and B, then it forces the complements to be: A' = non professional B' = the other brand Canon

  23. anonymous
    • one year ago
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    Okay got it. So how would I label that with P(A | B) and P(B | A)?

  24. perl
    • one year ago
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    P(A|B) means the probability of event A given that you know event B has already occured. On the table this means we only look at event B's row or column

  25. anonymous
    • one year ago
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    Okay, so P(8|12)?

  26. perl
    • one year ago
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    P( A|B) = P( professional | Nikon brand )

  27. anonymous
    • one year ago
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    Oh so I don't need to put any numbers in?

  28. perl
    • one year ago
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    The given part means that we only look in the row 'Nikon'

  29. anonymous
    • one year ago
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    Oh okay! So P(Profesional | Nikon) and P(Nikon | Profesional)?

  30. anonymous
    • one year ago
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    Professional*

  31. perl
    • one year ago
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    P( A|B) = P( professional | Nikon brand ) we look only in the Nikon row. http://prntscr.com/7kwtse therefore P(A|B) = 8/10

  32. perl
    • one year ago
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    the `|` symbol means 'given' .

  33. anonymous
    • one year ago
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    OHH I understand!

  34. anonymous
    • one year ago
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    And then vise versa for P(B | A)?

  35. perl
    • one year ago
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    yes

  36. anonymous
    • one year ago
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    Okay, what about P(A∩B) with P(A∪B)?

  37. perl
    • one year ago
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    P( B|A) = P( Nikon brand | Professional ) http://prntscr.com/7kwury 8/12

  38. anonymous
    • one year ago
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    Got it! What about my question above?

  39. perl
    • one year ago
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    Okay, what about P(A∩B) = 8/20 P(A∪B) = (8 + 2 + 4) / 20

  40. anonymous
    • one year ago
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    That's it?

  41. perl
    • one year ago
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    little more detail here

  42. perl
    • one year ago
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    P(A∩B) : probability of professional `and` Nikon http://prntscr.com/7kwx9w = 8/20 P(A∪B) : probiablity of professional `or` Nikon http://prntscr.com/7kwxo7 = (8 + 2 + 4) / 20

  43. perl
    • one year ago
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    You can think think of it in terms of intersection of row and column P(A∩B) http://prntscr.com/7kx0gv

  44. anonymous
    • one year ago
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    Ohh okay! So I said... Compare P(A∩B) with P(A∪B), and explain what each probability means in the context of the situation and data you collected.: P(A∩B) = 8/20 (probability of professional and Nikon). Here, were only looking at the eight professional Nikon photographers. P(A∪B) = (8 + 2 + 4) / 20 (probability of professional or Nikon). Here, we’re using data from the professional column of Canon and Nikon plus Nikon’s two non-professionals.

  45. perl
    • one year ago
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    Looks good :)

  46. anonymous
    • one year ago
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    Okay great! Thank you so much! Only three more homework assignments till I graduate!

  47. perl
    • one year ago
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    A∩B is also called `A intersect B` or `A & B ` A∪B is called `A union B` or `A or B `

  48. perl
    • one year ago
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    Good luck :)

  49. anonymous
    • one year ago
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    Alright, it's in my notes now. Thank you!

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