What percentage of African American families live below the poverty line?

What was Adam Smith's argument for why capitalism is beneficial to society?

a) Under capitalism, every person is able to maintain an income that provides basic necessities. b) Under capitalism, people are forced to give to charity. c) Under capitalism, people put the needs of society first. d) Under capitalism, people's selfish acts contribute to the common good

If a factorial study involves a significant interaction,

a. there can be no significant main effects. b. any main effects might have been obscured by the interaction. c. all main effects have to be considered together. d. the result is an ex post facto study.