Re: ISI 2008 MATH PROBLEM...

Posted by Amrita on Mar 30, 2015; 4:38am
URL: http://discussion-forum.276.s1.nabble.com/ISI-2008-MATH-PROBLEM-tp7596028p7596033.html

dear leon,
          my bad. i read it as covariance.
the first equation is 2x+3y-1=0 ........1
so,
2(mean of x)+3(mean of y)-1=0........2
deduct eq 2 from 1
and write it in the form of variance
so you get the variance of x in terms of y.
formula for correlation coefficient is cov(x,y)/sd(x)sd(y)
replace all the equations in the formula and u wl get -1.

repeat the same procedure with the 2nd equation.