To test the effect of music on productivity, a group of assembly line workers are given portable mp3 players to play whatever music they choose while working for one month. For another month, they work without music. The order of the two treatments for each worker is determined randomly. This is
A) a matched pairs experiment.
B) a completely randomized experiment.
C) a block design, but not a matched pairs experiment.
D) an observational study.
E) impossible to classify unless more details of the study are provided.
Answer: a matched pairs experiment
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