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The control group stays the same throughout the entire experiment.
To have something to compare the rest of the experiment to
A control setup is something where you know how it will behave. It gives you a reference to measure affect of all other variables.
the purpose of doing an experiment is to discover new things
All science experiments are performed in a controlled manner which means, there will be a positive control, a negative control and importantly the subject sample(s) who's behavior is not known. The experimental observation must be positive with the positive control sample and negative with the negative control sample, no matter whatever the condition is. Only in this set up the result of a subject (which is the actual unknown experimental sample) would be considered as a faithful result.Any fault or irregularities of the controls will destroy the authenticity of an experiment.
The control group stays the same throughout the entire experiment.
Having a control in an experiment allows you to see what happens when no variables are changed. If you do not have a control, you do not have anything to compare your results with after changing variables of the experiment.
nothing
To have something to compare the rest of the experiment to
the control for multiple variables in a experiment
The purpose of a control variable in an experiment is to allow the experiment to come out with accurate results. It makes it a lot easier to measure the results when different things aren't affecting it.
The defintion of a control group in an experiment is a standard for comparison. So then the purpose of the whole control group during an expirenment is to have something to compare your data to.
A negative control is a control group in an experiment where the variables are not expected to have an effect. It helps researchers to determine if any observed effects are due to the treatment being tested or other factors.
A control setup is something where you know how it will behave. It gives you a reference to measure affect of all other variables.
The purpose of a control group is to show what would happen under normal conditions. It serves as a comparison to the results you receive from the manipulation of the independent variable on the dependent variable. If a control group is present in an experiment, one can be more certain that the independent variable is really responsible for the observations.
the factor an experiment that is changed on purpose
The purpose of a control in any experiment is so that you have a natural example to look at at. Ex: If I was doing an experiment on fertilizer, I'd have three different fertilizers and a plant without fertilizer so I could see how it would grow without fertilizer so I could backtrack if need be.