Transcript Variables in a Scientific Experiment

Variables in a Scientific
Experiment
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.
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.
Independent Variable Trick to
Remember
IChOP
Independent
Change
On
Purpose
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.
Dependent Variable Trick to
Remember
DRUM
Dependent
Response
U
Measure
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.
Number 1
Changing your underwear
every day may help you to
feel more refreshed.
Number 2
Getting more dates would
be likely if you start
wearing deodorant.
Number 3
Brushing your teeth can
reduce the chances of
having bad breath.
Number 4
Having lots more
friends can happen if
you bring your sweaty
gym clothes home for
your mom to wash.
Number 5
Wearing a Speedo while
swimming may take seconds
off your breaststroke.
Number 6
To make your family
happy, wear odoreaters in your shoes.
Number 7
Passing gas on your 1st
date will guarantee the
loss of a second date.
Number 8
Flossing your teeth with
your toenail will make
your sister vomit.
Copy this template into page ____ of
your journals.
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