Tuesday, March 24, 2015

STEM Fair - Variables - Due 3/23/15

There are 3 types of variables that must be considered

INDEPENDENT VARIABLE
  • There is only one Independent Variable
  • This is the one thing that will be changed on purpose to find out what effect it has on something else.
    • Are you changing the height, temperature, amount, liquid, etc.
  • Example, if you are testing whether or not water temperature has an effect on the dissolving time of Alka-Seltzer, then the Independent Variable will be the temperature of the water.

DEPENDENT VARIABLE
  • There is only one Dependent Variable
  • This is what factor is being observed or measured to see if it is affected by the change theIndependent Variable made.
    • What are you measuring and how?
  • In the example above, the Dependent Variable will be the dissolving time of the Alka-Seltzer.

CONTROLLED VARIABLES
  • All other materials in the experiment must remain exactly the same.
  • In the example above, the thermometer, Alka-Seltzer, type of water, cups, etc.