A researcher was interested in the impact of listening to different types of music on learning. She designed an extensive maze for rats and after she taught rats how to get through the maze, she randomly assigned each rat to run the maze while (a) listening to classical music, (b) listening to heavy metal music, or (c) in a quiet room (i.e., no music). The researcher measured the amount of time it took each rat to get through the maze and the number of errors made.

a. Independent Variable ? _________________ What are the levels? ________________________________

b. Dependent Variable ? _____________________________

c. What might be an extraneous variable?: ___________________________________

d. Control group? _________________ Experimental Group(s)?____________________