___________: That which has a potential influence on the dependent variable and needs to be removed or controlled

Privatization of government services has been most successful

A. when the economy is strong. B. when the economy is weak. C. at the local level. D. at the federal level. E. when the economy is strong and at privatization of government services is at the federal level.

Containment was the U.S. foreign policy goal of limiting the spread of communism until it failed to work in:

a. the Iranian hostage crisis. b. the Vietnam War. c. the invasion of Kuwait. d. the September 11th attacks.