If you change the amount of a variable to see its effect, this is called manipulating the what?

• A. Dependent variable
• B. Control variable
• C. Experimental condition
• D. Independent variable

Answer: (D)

Changing the amount of a variable to see its effect is manipulating the independent variable. In an experiment, you deliberately vary this variable to observe how the outcome changes. The thing you measure in response is the dependent variable. Keeping other factors constant are the control variables to prevent them from influencing the result. The experimental condition refers to the specific setup or level of the manipulation, but the act of changing the amount itself is what defines the independent variable.