G An article in Concrete Research "Near Surface Characteristics of Concrete: Intrinsic Permeability, (1989, Vol. 41) presented data on compressive strength x and intrinsic permeability y of various concrete mixes and cures. Summary quantities are n = 14, Xn i=1 yi = 572, Xn i=1 y 2 i = 23530, Xn i=1 xi = 43, Xn i=1 x 2 i = 157.42, Xn i=1 xiyi = 1697.80 Assume that the two variables are related according to the simple linear regression model. (a) (20pts) Calculate the least squares estimates of the slope and intercept.