Variables in a Scientific Experiment
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Variables in a Scientific Experiment
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Controlled Experiment
• Controlled Experiments have variables.• Variables are the things in an
experiment that are or could be changed.• There are three kinds of variables.
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Independent Variable
• Also called Manipulated Variables.• This is changed by the scientist on purpose.• It is a single factor in an experiment that the
scientist chooses to change.• It is the difference between groups.• The “cause” of a change.• When something is observed or changed over a
period of time, then TIME is the independent variable.
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Independent Variable Trick to Remember
IChOPIndependentChangeOnPurpose
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Dependent Variable
• Also called Responding Variable.• This responds to the Independent Variable
changing.• It is the effect caused by the Independent
Variable.• What is observed.• What is measured.• The data collected.
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Dependent Variable Trick to Remember
DRUMDependentResponseUMeasure
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Constant Variables
• Things in an experiment that are kept the same.• They could change, but don’t.• Kept constant by the scientist.• Allow for a fair test.
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Number 1
Changing your underwear every day may help you to feel more refreshed.
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Number 2
Getting more dates would be likely if you start wearing deodorant.
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Number 3
Brushing your teeth can reduce the chances of having bad breath.
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Number 4
Having lots more friends can happen if you bring your sweaty gym clothes home for your mom to wash.
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Number 5
Wearing a Speedo whileswimming may take seconds off your breaststroke.
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Number 6
To make your family happy, wear odor-eaters in your shoes.
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Number 7
Passing gas on your 1st date will guarantee the loss of a second date.
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Number 8
Flossing your teeth with your toenail will make your sister vomit.
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