Which phrase describes a study in which all sample members are surveyed only once?
a) cross-sectional study
b) interview

Which of the following best completes the diagram above? a. land ordinance b. northwest ordinance c. revolutionary war d. shays' rebellion

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

Which of the following situations best demonstrates the principle of separation of powers in the u. s. government? a. the president can veto laws passed by the legislature. b. the courts must approve constitutional amendments. c. states create their own educational policies. d. members of the legislature are elected by voters.