Which of the following is NOT a nontariff barrier to trade (NTBs)?

In a stepwise multiple regression analysis, predictor variables enter the regression equation if they

a. correlate with the outcome variable b. correlate with one another c. predict unique variance in the outcome variable d. account for more variance than all other variables e. are selected by the researcher

Aaron Wildavsky's "two presidencies theory" posits that _____________

A) the president can use the "bully pulpit" to communicate policies and generate support B) the senate would exert a strong influence over the nation's foreign policy C) a unitary chief executive can respond quickly and forcefully to sudden changes D) separation of the power to command from the power to fund the military was to check the war power from being abused E) the president has more power in foreign affairs than in the domestic sphere