A student is investigating the question “Which increases a person’s breathing rate more after three minutes, lifting five-pound weights or lifting ten-pound weights?” She designs an experiment to test the question. Which is the dependent variable in her experiment?

The dependent variable is what the experiment measures as the outcome. Here, the student measures breathing rate to compare how it changes after lifting different weights, so the dependent variable is breathing rate. The weight lifted is the independent variable because it is what she changes.

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