Presidents cannot fire their vice presidents, as they can other aides

When two or more independent variables are exerting an effect on the dependent variable each is said to have a(n) ________________.

a. Additive effect b. Spurious effect c. Partial effect d. Interactive effect

Which of the following were not involved in Iraq’s sectarian violence during the Iraq War that began in 2003?

a. Sunni Muslims. b. Shia Muslims. c. Sufi Muslims. d. Ethnic Kurds.