Holding everything else constant, an increase in x leads to an increase in y?
No, only if model upholds ZCM
ZCM can be tested?
No, consider E[u], u is unnobservable
Cov(x,û) = 0 only under the ZCM.
False, it is always true
estimated wage = 7.1 - 2.51 female
do these estimates provide convinving evidence that gender pay gap exists?
No, omitted variables
Interpret the coefficient
Has B effect on y, CETERIS PARIBUS