Date: Nov 4, 2008 8:25 PM
Author: need_for_help
Subject: Please help

Dear all,

Please could you help me with the following.

I am trying to solve a problem in which it is asked to compute Covariance(X,Y). 

The information the problem gives are:

sum Xi = 859;        sum Xi^2 = 47 387
sum Yi = 1 095;      sum Yi^2 = 78 737
sum XiYi = 60 262;   n = 18;     i = 1, ...n

COV(X,Y) = ? 

Many thanks!