ACT Preparation / Unit 20 ACT 1908 short lesson, about 20 seconds
Controlled Variables
Captions available
The idea
Controlled variables are the factors kept the same across all trials, so that only the independent variable differs.
In practice
In the bean study, pot size, soil, water and temperature are controlled; only the light color changes.
Where people slip
A factor left free to vary becomes a second possible cause of the result.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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