Using a sample of 3,924 full-time workers a researcher is interested in examining the determinants of wages. She collects data on hourly wages (wage), gender (male=1 if a male and zero otherwise), years of labour market experience (exper) and years of schooling (school). These data are used to estimate the following regression ???????????????????? = ????1 +????2????????????????+????3???????????????????????? +????4????????????????????????? + ?????