13. Use the following information to create a regression model: M E(x- X) =60 Ex-x(Y - n) = 84 i=1 Ex? =789 Yi = 144 E(Y - 1)2 = 144 E(Y; - bo - bix)? = 26.4 1 = 9 A. Calculate the sample mean, variance, and standard deviation for X and for Y. B. Calculate the sample covariance and the correlation between X and Y. C. Calculate bo and by for a regression of the form Y, = bo + bix;. For the remaining three parts of this question, assume that the calculations shown above already incorporate the correct values for bo and by. D. Find the total variation, explained variation, and unexplained variation. E. Find the coefficient of determination. F. Find the standard error of the estimate