Question

Eric wants to verify that automatic toothbrushes work better than manual toothbrushes. To test this, he randomly assigns 25 participants to use a Sonicare toothbrush and 25 people to use a manual toothbrush. At the end of the study period he has a dentist inspect each participants' teeth. In his study, the _____ would be considered the independent variable, whereas the _____ would be considered the dependent variable.

Answer 1

Answer: independent variable = teeth

dependent variable = tooth brush

Explanation: In this experiment, the independent variable (teeth) is the subject that is being tested. The dependent variable (toothbrush) is the the experimentor.