All of these things are controlled for. These are professors whose job it is to make sure you don't have such confounding variables. You even have twin studies where one twin was adopted by rich and one by poor parents…
If you look at job performance: http://psycnet.apa.org/record/2003-11198-010
All of these things are controlled for. These are professors whose job it is to make sure you don't have such confounding variables. You even have twin studies where one twin was adopted by rich and one by poor parents…
If you look at job performance: http://psycnet.apa.org/record/2003-11198-010