Select all the statements that are true of a leastsquares regression line. I] The sum of the squares of the residuals is the smallest sum possible. D The slope of the regression line is resistant to outliers. I] In the equation of the least-squares regression line, I; is an observed value when X is known. The regression ljne maximizes the residuals between the observed values and the predicted values. A In the equation of the least-squares regression line, Y is a predicted value when X is known. [I R2 measures how much of the variation in Y is explained by X in the estimated linear regression. Incorrect