Originally Posted by
jackroberts4 Hello All,
This is my first time visitnig math helop forum and I was wondering if anyone could help me with a HW problem. I have posted it below. Thanks a lot:
1. The problem statement, all variables and given/known data
X and Y are random variables and have the following joint probability mass function
q(x,y)=1/p^2 for x=1,2,....p and y=1,2,....p
are x and y independent?
2. The attempt at a solution
What I want to do is find the marginals for x and y and then see if q(1,1) is equivalent to qx(1) times qy(1)
I know the marginal for x is the summation from y=1 to p of 1/p^2. Y is the same except switch to x for the summation. I just don't know how to get the summation. Can anyone help with this?
Secondly, can P(1,2) even exists? Don't the x and y values have to be the same since p(x,y) is 1/p^2 and if x and y are different, what value would you use for p?
I'm completely lost and I would appreciate all help. Thanks.
I would appreciate any help with this problem. Thank You.