You estimate a regression equation that estimates individuals’ yearly income as a function of age (measured in years), years of education, and their score on a standardized intelligence exam (IQ...

You estimate a regression equation that estimates individuals’ yearly income as a function of age (measured in years), years of education, and their score on a standardized intelligence exam (IQ test). The estimated coefficients are:

I = 26.3 + 4.21*Age + 7.21*Education + .23 * IQ

Where I is income measured in
thousands of dollars.

Based on the regression results, how much more should an individual earn after attending graduate school for two years? Explain your reasoning.