How much do Americans spend on health care each year?

Constitutionally and by tradition, the major responsibility for making and conducting U.S. foreign policy belongs to

a. the President. b. the Vice President c. the Senate. d. the governors of each State.

Hannah is conducting a study on campus parking for her psychology class. She begins her study by identifying naturally occurring groups of individuals who park on campus. These include those who park in the north, south, east, and west lots

She then sample participants from each of these groups. Hannah is using probability sampling. a. simple b. stratified c. systematic d. cluster