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Suppose that X and Y are random variables such that E(Y | X) = 7 - (1/4)x and E(X | Y) = 10 - Y . Determine the correlation of X and Y .

Edit:

So far I've got

E(x)=4 E(y)=6

Now I'm trying to find

E(xy) to use in cov(x,y)=E(xy)-E(x)E(y)

V(x)

V(y)

all to use in cor(x,y)=cov(x,y)/(v(x)v(y))^.5

  • 0
    Correlation as measured by...?2012-12-05
  • 0
    cor(x,y) = cov(x,y) / (v(x)v(y))^.5 ...Im not sure I understand your question though2012-12-05
  • 0
    Pearson's is a fine way to define correlation; it's just not the only way.2012-12-05

1 Answers 1