# Experiment help?my experiment - HOW MUCH WATER DO I USE WHILE BRUSHING MY TEETH FOR A CERTAIN AMOUNT OF TIME WHEN COMPARED TO THE AVERAGE USE OF WATER AN AMERICAN USES WHILE BRUSHING THEIR TEETH...

Experiment help?

my experiment -

HOW MUCH WATER DO I USE WHILE BRUSHING MY TEETH FOR A CERTAIN AMOUNT OF TIME WHEN COMPARED TO THE AVERAGE USE OF WATER AN AMERICAN USES WHILE BRUSHING THEIR TEETH FOR THE SAME AMOUNT OF TIME…?

what would the independent, dependent variables be. and what would the control and experimental group be?

bandmanjoe | Middle School Teacher | (Level 2) Senior Educator

Posted on

Well, lets see here.  Wouldn't that be the same amount of water, if you were both brushing your teeth for the same amount of time?

What we need to do here is understand what the relationship between the independent and dependent variables in a science experiment are.  The variables are the things in an experiment you change.  You think something causes something else, so you design an experiment to demonstrate that.  In this experiment, the thing you think causes whatever effect is called the independent variable.  It's called the independent variable because it's the one that gets to change.  All the other variables you keep the same, or constant.  Those are called control variables.  We call them control variables because we want to test one variable at a time.  Otherwise, how could we honestly say the independent variable was the reason for causing the change we think will happen?

The effect the independent variable has is called the dependent variable.  We call it the dependent variable because it is the one that depends on the independent variable.  It is what provides our evidence we thought would happen as a result of the independent variable doing what it does.

So this experiment does not have a clear independent variable or dependent variable.  A better one would be the relationship between how long you brush your teeth and the number of cavities you have at your next dental checkup.  The time spent brushing teeth would be the independent variable, while the number of cavities would be the dependent variable.

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