Which Washington, DC, location has become synonymous with the lobbying firms that represent America's biggest and most powerful interests?

A 19th-century political leader who saw the Constitution as a compact among the states and believed that the states could nullify federal laws was:

A. John Marshall. B. Thomas Jefferson. C. John Calhoun. D. Henry Clay.

Kathy wants to know if using video examples in her classes will help to improve student learning

Kathy decides to show students in one section of her General Psychology class videos to supplement the material and students in the other section of her General Psychology class are not shown videos. Kathy then compares tests scores between the two classes to see if the videos increased student learning. However, before making the comparison, Kathy decides not to use scores from students who are repeating the course. What disadvantage of a between subjects design does Kathy avoid by not including students who are repeating the course? a. practice effects b. order effects c. carry over effects d. all of the above