12. The following means, standard deviations and correlations dre found for X1 = seed hay crop in cwts. per acre, X2 = spring rainfall in inches, X3 = accumulated temperature above 42° F in spring, in a certain district of England during twenty years. X1 = 28-02, o1 = 4-42, r12 =+0-80, X2 = 4-91, 02 = 1·10, r13=-0-40, X3= 594, 03 = 85, 23 %3D -0-56. Find the partial correlations and the regression equations for hay-crop on spring rainfall and accumulated temperature.

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