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.
There are three types of variables tested: manipulated variables, controlled variables, and experimental variables.
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In a controlled experiment only 1 variable is being tested.
An experiment of any kind can have infinitely many variables. A controlled experiment can have just as many, provided that all but one are kept exactly the same.
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There are three types of variables tested: manipulated variables, controlled variables, and experimental variables.
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In a controlled experiment only 1 variable is being tested.
An experiment of any kind can have infinitely many variables. A controlled experiment can have just as many, provided that all but one are kept exactly the same.
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Only the one being tested
Every variable except for the one being tested should be controlled.
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to gather data from data to create an controlled experiment
to gather data from data to create an controlled experiment
to gather data from data to create an controlled experiment