\f3. Answer the following question for where Y has been regressed on X1, X2, and X3. Use the linear regression output in the Excel le. Your answers should be rounded to 2 decimal places. a. What is the equation for the line of best fit or regression line? b. The proportion is for the amount of the variability of Y that is explained or accounted for by the model. c. The correlation between the observed values of y and the expected values of y is d. The residual is for when X1,=23, X2 = 220, and X3 = 11. e. What is the expected value of Y when X1,=65 X2 = 200, and X3 = 10