- #1
MaxManus
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- 1
Homework Statement
if x1 and x2 are dependent, and y1 and y2 are dependent, but all the x are independent of all the y.
Then how can one simplify
E(x1y1x2y2)?
the textbook says
E(x1x2)E(y1y2)
So is the rule that you can not just separate two independent variables which they are multiplied with a third variable which are dependent on the first variable? But you can separate a group of variables which all the elements in the first group is independent of all the elements in the other group?