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Researchers believe that exercise raises the body's metabolic rate for as long as 12 hours and thus enables us to burn off fat after our

Researchers believe that exercise raises the body's metabolic rate for as long as 12 hours and thus enables us to burn off fat after our workout ends. To study this effect, subjects were asked to walk briskly on a treadmill for an hour. Their metabolic rate was measured before, immediately after, and 12 hours after exercise.

Was this study an experiment? Why/why not?
What is the explanatory variable?
What is the response variable?

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