Hi everyone,
we just leanred the cov, and I'm trying to apply the formula
cov(X,Y)=E(XY)-E(X)E(Y) to the following question
f(x,y)=(0.6)^x(0.4)^1-x(0.3)^y(0.52)^1-y(2)^xy where poss. values for X and
Y are x=0,1 and y=0,1.
The prof. never gave us any examples for cov and neither does the text
here is one VERY simple example
the COV is the AVERAGE of the PRODUCTS of the deviations around the means
... of two variables
if the cov is + .. there is a + relationship between X and Y, if it is -,
there is a - relationsip between X and Y
X Y devX devY (devX)(devY)
10
