In general what is the expectation of the sum of yi minus ybar squared is this the same as the sum of of VAR(Y)?
Last edited by kingsolomonsgrave; Nov 5th 2013 at 12:48 AM.
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Hey kingsolomonsgrave. What do you mean by sum of Var[Y]? Can you write it out in terms of sigma notation and expectation/variance of random variables?
var(Y) in terms of expectation is and
This looks right and remember also that expectation is linear so if you have a sigma inside the expectation, you can take it outside the expectation as well.
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