To study the effect of music on production in a cell phone factory, two experimental treatments are planned:
day-long classical music for one group versus day-long rap music for another. Which of the following groups would serve best as a control for this study?
Group of answer choices
A third group for which no music is played
A third group that listens randomly to classical or rap music each day
A third group that listens to country music
A third group that splits the day with classical music and rap music
A third group in which each worker chooses either classical music or rap music and listens via headphones