anonymous
  • anonymous
Help with probability?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
I will help :) What's the problem
anonymous
  • anonymous
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.:

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undeadknight26
  • undeadknight26
Alright do you know how to find the probability of this? Or is that what you need help with?
anonymous
  • anonymous
I'm just kinda lost on what column to choose.
anonymous
  • anonymous
And where to go from there.
undeadknight26
  • undeadknight26
Choose any one
anonymous
  • anonymous
Okay, how about Nikon professional photographers to Canon professional photographers?
anonymous
  • anonymous
undeadknight26
  • undeadknight26
One second please :)
anonymous
  • anonymous
Okay, sorry!
undeadknight26
  • undeadknight26
It's fine m8 :)
undeadknight26
  • undeadknight26
I'm just refreshing my memory on probability lol
undeadknight26
  • undeadknight26
Well you chose the Professional column right?
anonymous
  • anonymous
Yes!
undeadknight26
  • undeadknight26
undeadknight26
  • undeadknight26
Sorry mate I thought I could do it but I forgot everything about probability :/
perl
  • perl
Would you like help with this?
anonymous
  • anonymous
Yes please!
perl
  • perl
you want to compare P(A|B) and P(B|A) First lets define A and B
anonymous
  • anonymous
Okay, how?
perl
  • perl
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
anonymous
  • anonymous
Okay got it. So how would I label that with P(A | B) and P(B | A)?
perl
  • perl
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
anonymous
  • anonymous
Okay, so P(8|12)?
perl
  • perl
P( A|B) = P( professional | Nikon brand )
anonymous
  • anonymous
Oh so I don't need to put any numbers in?
perl
  • perl
The given part means that we only look in the row 'Nikon'
anonymous
  • anonymous
Oh okay! So P(Profesional | Nikon) and P(Nikon | Profesional)?
anonymous
  • anonymous
Professional*
perl
  • perl
P( A|B) = P( professional | Nikon brand ) we look only in the Nikon row. http://prntscr.com/7kwtse therefore P(A|B) = 8/10
perl
  • perl
the `|` symbol means 'given' .
anonymous
  • anonymous
OHH I understand!
anonymous
  • anonymous
And then vise versa for P(B | A)?
perl
  • perl
yes
anonymous
  • anonymous
Okay, what about P(A∩B) with P(A∪B)?
perl
  • perl
P( B|A) = P( Nikon brand | Professional ) http://prntscr.com/7kwury 8/12
anonymous
  • anonymous
Got it! What about my question above?
perl
  • perl
Okay, what about P(A∩B) = 8/20 P(A∪B) = (8 + 2 + 4) / 20
anonymous
  • anonymous
That's it?
perl
  • perl
little more detail here
perl
  • perl
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
perl
  • perl
You can think think of it in terms of intersection of row and column P(A∩B) http://prntscr.com/7kx0gv
anonymous
  • anonymous
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.
perl
  • perl
Looks good :)
anonymous
  • anonymous
Okay great! Thank you so much! Only three more homework assignments till I graduate!
perl
  • perl
A∩B is also called `A intersect B` or `A & B ` A∪B is called `A union B` or `A or B `
perl
  • perl
Good luck :)
anonymous
  • anonymous
Alright, it's in my notes now. Thank you!

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