Just one at a time
There are three types of variables tested: manipulated variables, controlled variables, and experimental variables.
Experimental variables are factors being tested or measured in a scientific experiment. They can be categorized as independent variables (manipulated by the experimenter), dependent variables (respond to the changes in the independent variable), and controlled variables (kept constant to prevent interference).
Independant variables
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Independant variables
It depends on the experiment. Normally only one is tested at a time because they can affect the experiment. Variables are tested in a controlled experiment to see whether they affect the outcome and also how.
In earth science, a control is an experimental element that remains constant or unchanged throughout an experiment. Controls are used to compare results and determine the impact of specific variables being tested. By keeping certain factors constant, scientists can isolate the effects of the variables they are studying.
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Independent variables
experimental group
experimental group
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