An article presented data on compressive strength x and intrinsic permeability y of various concrete mixes and cures. Summary quantities are n = 14, y; = 572, y = 23530, Exi = 43, x? = 157.42, and x;y; = 1697.80. Assume that the two %3D variables are related according to the simple linear regression model. Round your answers to 3 decimal places. (a) Test for significance of regression using a = 0.05. (b) Estimate o?. (c) In this model, what is the standard error of the intercept?

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