We are asked to derive the expected value of each of the above estimators conditional on X. it states that you can treat x1; x2.

We are asked to derive the expected value of each of the above estimators conditional on X. it states that you can treat x1; x2.....xn and any expression that only involves these, such as xbar as constants. Then based on these, see if they are an unbiased estimator of beta1