You read a report saying that those who listen to music before they drift off to sleep

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You read a report saying that those who listen to music before they drift off to sleep tend to be extraverts while those who read books before they drift off to sleep tend to be introverts. What are the two variables in this study?

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Statistics Alive

ISBN: 9781544328263

3rd Edition

Authors: Wendy J. Steinberg, Matthew Price

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