Separate random samples were collected by a polling agency to investigate the difference in employee satisfaction at non-profit organizations and at for-profit companies. Data collected from 451employees at non-profit organizations revealed that 402 of them were "highly satisfied." From the for-profit companies, 439 out of 529 employees reported the same level of satisfaction. Researchers want to test if the proportions of satisfied employees are the same at for-profit companies as at non-profit companies. Complete parts a through c below. a) What is the difference in the proportions of the two types of companies? Assume p^1 is the proportion of satisfied non-profit employees and p^2 is the proportion of satisfied for-profit employees. The difference in the sample proportions, p^1p^2, is (Round to three decimal places as needed.)