Re: ISI questions on correlation

Posted by deepak on Apr 17, 2012; 12:41pm
URL: http://discussion-forum.276.s1.nabble.com/ISI-questions-on-correlation-tp7472992p7473382.html

Thanks Neha, but I'm not too sure I understand.

For question 1, how did you arrive at the formula for Var (Xbar)? After that your explanation sounds perfect, but I couldn't understand how you got that expression.

For question 2, I get the +vely correlated in the 1st, -vely correlated in the 2nd funda, but I don't understand how the correlation coefficients are equal. And um, how do I figure out what the correlation coefficient between 2 variables is, from the linear equation?