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You use a free phone app to track how many steps you take in a day. The app sends you an add that says, People

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You use a free phone app to track how many steps you take in a day. The app sends you an add that says, \"People who pay for our premium version take 21% more steps in a day than those who use the free one!" What is a possible confounding variable to explain the relationship between people who pay for the premium app and number of steps? How might the confounding variable affect the results

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