3. What is the difference in the probability of smoking between workers affected by a workplace smoking ban and workers not affected by a workplace smoking ban? Use a linear probability model to determine whether this difference is statistically significant.

\fVariable Definitions Variable Definition smoker =1 if current smoker, =0 otherwise smkban =1 if there is a work area smoking ban, =0 otherwise age age in years hsdrop =1 if high school dropout, =0 otherwise hsgrad =1 if high school graduate, =0 otherwise colsome =1 if some college, =0 otherwise colgrad =1 if college graduate, =0 otherwise black =1 if black, =0 otherwise hispanic =1 if Hispanic =0 otherwise female =1 if female, =0 otherwise