Your textbook discussed the regression model when X is a binary variable
Yi = β0 + β1Di + ui,i = 1... ,n
Let Y represent wages,and let D be one for females,and 0 for males.Using the OLS formula for the slope coefficient,prove that 
is the difference between the average wage for males and the average wage for females.
Definitions:
Freudian Stage
Refers to any of the phases in Sigmund Freud's theory of psychosexual development, where each stage is associated with a specific conflict that must be resolved for healthy psychological development.
Personality Development
The pattern of growth and change in an individual's personality traits and characteristics throughout life.
Unconscious
The part of the mind that contains thoughts, memories, and desires that are not accessible to conscious awareness.
Generativity
A term coined by Erik Erikson that refers to the concern for establishing and guiding the next generation.
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