1. For each statement below answer true or false. The first word of your answer has to be either true or false. If the first word of your answer is not true or false you receive 0 points. If the statement is true you are finished answering. If your answer is false, briefly explain why it is false. a. Econometrics exists because we deal primarily with observational data. b. An estimator cannot be unbiased if heteroskedasticity is present." c. The Gauss-Markov Theorem shows that the OLS estimator has the smallest variance out of all of the unbiased estimators." d. SLR 3 is an assumption about the error term. e. R2 = 28.57% if the explained sum of squares is 35, the total sum of squares is 49, and the residual sum of squares is 14