Dr Zilgar Has Two Groups of Students Who Are Otherwise

Multiple Choice

Dr. Zilgar has two groups of students who are otherwise equivalent study a chapter in a textbook. One group is assigned to study while classical music is playing and the other group is assigned to study while rock music is playing. He then measures how much they learn about the chapter. Dr. Zilgar's research design is

A) experimental.
B) correlational.
C) descriptive.
D) behavioral.