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Suppose you estimate the following sample model in order to say something about the relationship between y and x in the target population: yi=b0+b1xi+ei The standard error of the regression coefficient b1 is: O a. A measure of how close we can expect our sample estimate to be to the population parameter Q b.A measure of the tness of the model that indicates how close the predictions are to the observed values O c. An assumption we need to make in order to conduct inferential analysis O d.A measure of the tness of the model that indicates how far the predictions are to the observed values