Do people who work for non-profit organizations differ from those who work at for-profit companies when it comes to personal job satisfaction? separate random samples were collected by a polling agency to investigate the difference. data collected from 422 employees at non-profit organizations revealed that 377 of them were "highly satisfied." from the for-profit companies, 431 out 518 employees reported the same level of satisfaction. find the standard error of the difference in sample proportions.