The independent variable is the variable being manipulated

Textbooks in the United States

a) have to be approved by the federal government. b) are always chosen by state-wide committees. c) have become more heterogeneous in content since the 1960s. d) None of the above

What is an inherent power of the U.S. Congress?

a. a power enumerated in the Constitution  b. a power not specified in the  Constitution, but inferred as necessary  c. a power neither stated nor implied in the Constitution but considered necessary to the country’s existence  d. A power designated to the U.S. Senate, but not to the House of Representatives