Which statements about education and achievement in the United States are true? (Choose every correct answer.) Multiple select question. Some schools may reinforce inequality. Those with more education tend to be overqualified for most jobs. There is a an important relationship between achievement in school and career opportunities. Every child has equal access to the same educational opportunities.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )

not  

cuba  

russia  

iraq  

el salvador  

explanation:

known as the land of volcanoes, el salvador has visit seismic tremors and volcanic movement. it is the main nation in central america that does not have a coastline on the caribbean sea. about portion of all salvadorans live in the wide open. they are poor and don't have power or running water in their homes. in 1525, pedro de alvarado, a lieutenant of cortés's, vanquished el salvador. el salvador, with alternate nations of central america, pronounced its freedom from spain on sept. 15, 1821, and was a piece of a league of central american states until the point when that association broke up in 1838.