How to determine control group in science experiment?
This is my idea, I making a small bridge made out of paper and will test how many nickels it takes to make the bridge fall. Each time the bridge falls, I will increase the thickness of it (adding more paper). My IV is thickness of paper, DV is # of nickels needed to sink bridge, and what would my control group be? And also please explain to me how to find it in most experiments. Thanks
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Verified answer
It look as though you have two changing variables and no constant variable here. If you are looking to plot the points on a graph and depict the strength of the bridge as the thickness of paper is increased, then you would not need a control.
However, if you were using two separate bridges each with only one piece of paper, but one of them had a certain chemical applied to it, then the one without the applied substance would be the control.