Consider equation (10.34).

(a) Offer an informal explanation of why the second term to the right of the equality in equation (10.34) might be written as

(b) Demonstrate that, if the approximation in part a is valid, then the following approximation is also valid:

Transcribed Image Text:

(7-7) - i=l COV (2) COV (z,, x) (2-2)* i=1