i am testing between two pieces of chalk, one is brown and one is white, and the question is which one will last longer on a board.|||The independent variable is the type of chalk, the dependent variable can be either the total length of the line produced on the blackboard or the amount of time it takes to use up the chalk given equal usage. It depends upon how you set up your experiment.
Honestly I haven't a clue as to how one would set up a control for this.
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