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

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