An article in Concrete Research ("Near Surface Characteristics of Concrete: Intrinsic Permeability," Vol. 41, 1989), presented data on compressive strength x and intrinsic permeability y of various concrete mixes and cures. Summary quantities are n = 14, Ey; = 572, y = 23,530, Ex = 43, Ex? = 157.42, andEx;y, = 1697.80. Assume that the two variables are related according to the simple linear regression model.

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