Suppose you are interested in investigating the determinants of earnings.

earnings = + education + female +

Where earnings is measured in dollars, education is measured in years, and female is a dummy variable taking value 1 if female.

Suppose you standardize all the variables, and got the following estimates:

z_earnings = 0.13 z_education - 0.32 z_female

Which of the following is correct?

A. Holding gender constant, if education increases by 1 standard deviation, earnings will increase by 13 percent.

B. Holding gender constant, if education increases by 1 standard deviation, earnings will increase by 0.13 standard deviation.