Saturday, December 17, 2011

What is the independent variable, dependent variable and control?

can ice melt faster with hot water or cold water?|||The independent variable is something that isn't dependent on another variable, such as time.


The dependent variable is something that depends on the other, so say in a distance vs. time graph, the dependent variable is the distance while the independent is time.


The controlled variables are the ones you control, such as the speed of the object that's moving, whether it stays the same speed or accelerates/deaccelerates.


Hope this helped.


=]|||The independent variable would be what is not changing throught the experiment, your hot and cold water. The dependent variable would be what is changing, you are trying to melt your ice, so it is the dependent variable. Your control would be how fast your ice is melting without changing anything with the water.





I hope this helps. :o)|||the independent is the thing that gets changed (temp of water)


the dependent is the result (speed of melting)


control is the ice (amount, etc)|||Lori has the variables right but the control would be the experimental procedure that is not treated. You could do this experiment without a control or you could have a block of ice that is not exposed to water at all as your control.|||The I.V. is the H2O temp.


The D.V. is the time it takes the ice to melt.


Two examples of a Control Variable are:


- testing the time it takes ice to melt WITHOUT water


-testing the time it takes the ice to melt with LUKE-WARM water.


'Control' (verb) ensures that each process of the experiment is performed exactly the same and can be replicated:


the same ice type is used,


the original temp. of the ice is the same


the amount of ice %26amp; water are the same,


the containers are the same size and made of the same material, etc.





D


R


Y


M I X


This is a neat way to remember variables, their meaning, and their position on a graph. A teacher showed me this. I am not sure of the origin.





D=Dependent or 'Depends on other factors'


R=Responding variable (This can also stand for result or effect*).


Y=Always plotted on the Y-axis (This is the vertical / up and down axis just like the letter 'Y' reaches up).





M=Manipulated variable (This word means 'man' purposely set up this variable).


I=Independent variable is the CAUSE* (this variable is set up to determine its effect* on the Dependendent variable/the ways things turn out).


X=Always plotted on the X-axis (this axis, like the letter 'x' goes across and is the horizontal axis).





Every Hypothesis statement must have an I.V. and a D.V. (Note: Not every hypothesis statement will be proven correct but that doesn't matter. The more causes you eliminate the closer you get to the solution).





I.V. D.V.


Ex. The more concentrated the light source - the higher the temperature of the object beneath.


The 'concentration of light' is the cause, manipulated, or I.V.


'How high the object's temperature rises' is the effect, result or D.V.


(Note: The I.V. doesn't always come first).


Ex.


D.V. I.V.


The more bountiful and beautiful Gardenia blossoms - the healthier the bushes' leaves are.


[Gardenia blossoms are affected(effect / D.V.) by the leaves. If the leaves have Aphids or any other disease(cause / I.V.), the blooms are scarce and limp. Aphids are common on Gardinias].

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