Refer to the Journal of Personality and Social Psychology (Feb. 2012) study of on-the-job agreeableness and wages, Exercise 12.107. Recall that the researchers modeled mean income, E(y), as a function of both agreeableness score (x1) and a dummy variable for gender (x2 = 1 if male, 0 if female). Use the data saved in the file to analyze the residuals of the model,

What model modifications, if any, do you recommend?

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E(y) = B + Bix1 + B(x1)? + Br2