What is a manipulated variable?

A manipulated variable, also known as an independent variable, is a variable that is deliberately changed or adjusted by the researcher in an experiment to study its effect on the dependent variable. The manipulated variable is under the control of the researcher and is used to test a hypothesis or answer a research question.

In a scientific experiment, the manipulated variable is the one that is intentionally manipulated or changed to observe the impact it has on the dependent variable. For example, in a study investigating the effects of sunlight exposure on plant growth, the amount of sunlight (manipulated variable) can be controlled by varying the duration or intensity of light, while the plant growth (dependent variable) is measured and observed.

It is important to carefully plan and control the manipulated variable in an experiment to ensure that any observed changes in the dependent variable are indeed a result of the manipulated variable, and not due to other factors. Proper manipulation and control of variables are essential in conducting valid and reliable scientific research.