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provide examples of control, treatment and confounding variables.
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a control variable is a variable that is held constant throughout the experiment. an example of a control variable is the type of container in which the experiment is conducted. 

a treatment variable is a variable that is manipulated in order to observe the effect it has on the experiment. an example of a treatment variable is the temperature of the container. 

a confounding variable is a variable that could potentially affect the result of the experiment. an example of a confounding variable is the outside temperature, as this could affect the results of the experiment even if the temperature of the container is kept constant.
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