If you drop EMP from the equation, the estimated equation becomes: In (SAL) = 10.5 -0.002UNITS, + 0.08LANG, 4 0.015EXP. (2.47) (2.09) (8.65) Adjusted RZ - 0.871 N-25 Use our four specification criteria to decide whether you prefer the first (with EMP) or the second Equation (without EMP). Which do you like better? Why