# Question: a sample consists of 1388 observations where the unit of...

###### Question details

A sample consists of 1,388 observations, where the unit of
observation is an individual. packsi is the number of packs of
cigarettes woman i smoked per day while pregnant, and bwghti is the
birth weight (in ounces) of the woman’s child. Given the
information found in the attached STATA output,

(1) The population model implied by the regression output
is

(2) In the space below, provide a variable that could possibly
affect your dependent variable, but was not accounted for in the
simple linear regression model (i.e. is in the u term). Make sure
to clearly define your variable and briefly explain why you believe
it affects your dependent variable.