A researcher was interested in the effects of caffeine on memory. After administering various doses of caffeine to participants, she gave participants a test of memory. This is an example of research

The United States became involved in Vietnam to support the North Vietnamese who were fighting against communist aggression committed by the South Vietnamese

Indicate whether this statement is true or false.

The wealthiest 1 percent of Americans received the biggest of the Bush administration's 2001 tax cuts. This fact provides the best support for which of these claims?

a. Elites are unaccountable to the population as a whole. b. The federal government has grown too large and powerful. c. Political power tends to benefit those with money and connections. d. Economic growth requires reducing tax burdens on wealth creators.