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Variables & Controls

Selecting the variables and controls is a key element of proper experimental design, and on the ACT Science you should expect to see a few questions on this topic. Try out this sample question and then watch the solution below:

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Robert Schombs

About the Author:

I’m Rob Schombs, the founder of Reason Prep, creator of these videos, and your test prep tutor. I earned a BA in Chemistry (2006) and an MA in Science and Technology Studies (2009) from Cornell University. In 2010 I started tutoring SAT, ACT, math, chemistry, and writing full-time, and Reason Prep followed shortly after!

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