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One. If there is only one variable being tested, when you compare it to the control, you know that was the cause of a change.

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Q: How many variable should be tested and isolated in a good experiment?
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Related questions

Is a variable a prediction that can be tested with a experiment?

No, a hypothesis is. A variable is the thing being tested in the experiment.


In an experiment what is the factor that is tested?

variable


What variable is the part of the experiment that is being tested?

the independent variable


The variable is the part of the experiment that is being tested?

Independent variable ! :)


What is the dependant variable in sciences?

The dependant variable is what is tested in an experiment.


What is an experiment in which one variable is tested at a time?

Controlled Experiment :]


What variable was tested in Pasteur's experiment?

The tested variable is whether or not things rose spontaneously from the broth.


What variable is part of the experiment that is being tested or that is changed by the person doing the experiment?

The Independent variable


In an experiment what factor is tested?

The independent variable.


What is the one factor that changes an experiment?

A factor that changes in an experiment is called a dependent variable. It is the variable that is being tested.


What is the variable that is part of the experiment that is being tested called?

the independent variable


What do you call the variable part of the experiment that is being tested?

the independent variable