Researchers Are Investigating the Effects of Music on Compliance,wherein 50

Multiple Choice

Researchers are investigating the effects of music on compliance,wherein 50 percent of the participants listen to happy music and 50 percent listen to sad music.What technique should the investigators use to ensure that any post-test differences in the group's compliance will result from the differences in music listening?

A) random sampling
B) random assignment
C) replication
D) correlational measurement