One quick question. Two random variables are dependent, so it must be uncorrelated?
Also for the terminalogy, does the term "uncorrelated" means two random variables have a corvariance factor of 0?
note corvairance factor= Cov(X,Y)/sqrt(Var(X)*Var(Y))?
Yes, uncorrelated means that their covariance is zero.
Furthermore, if two random variables are independent, then they are indeed uncorrelated. However, if they are uncorrelated, that does not mean that they are independent.
i would advise reading http://en.wikipedia.org/wiki/Uncorrelated