To eliminate the possibility of hidden or unknown variables the scientist must a control experiment.
To eliminate alternative explanations for the result of an experiment
to isolate and test single variables
In an experiment the variables whose values are measured. A scientist measures how these variables respond to changes they make in an independent variable.
the only variables in an experiment are the independent variables [the thing in an experiment your going to change. and the dependent variables [the thing in an experiment your going to measure.
The number of dependent variables in an experiment varies, but there is often more than one. experiments also have controlled variables are quantities that a scientist wants to remain constant, and he must be observe them as carefully as the dependent variables.
To eliminate confounding variables, or variables that were not controlled and damaged the validity of the experiment by affecting the dependent and independent variable, the experimenter should plan ahead. They should run many checks before actually running an experiment.
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To eliminate alternative explanations for the result of an experiment
Observation.
Scientists change the independent variable but measure the dependent variable; other variables are kept constant.
to isolate and test single variables
If they are supposed to affect the results in the experiment ie. they are what is being tested, they are the test variables. If they must be kept the same to ensure a fair test ie. the scientist is not testing with them, they are called control variables.
to gather data from data to create an controlled experiment
In an experiment the variables whose values are measured. A scientist measures how these variables respond to changes they make in an independent variable.
Variables that do not change in an experiment are independent variables.
Variables that do not change in an experiment are independent variables.
Manipulated variables are variables that a scientist deliberately adds in to tweak the outcome of his or her experiment. For instance, a scientist may choose to add certain compounds into a pot of water to see if it may affect the boiling point.