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Independent variable

the factor that you want to test. It is changed by the experimenter to observe how it affects a dependent variable. Also called the manipulative variable.

Dependent variable

The factor you observe or measure during an experiment. Responds to the independent variable. Also called the responding variable

Constant

factors in an experiment that stay the same

Control Group

contains the same factors as the experimental group, but the independent variable is not changed. A standard used to compare.

Example: Miracle grow fertilizer

A B C D

5 gms 10 gms 20 gms 0 gms

miracle grow miracle grow miracle grow miracle grow

Independent variable: amount of miracle grow

Dependent variable: height of plant

Constant: type of plant

same fertilizer

same amount of water

same amount of sunlight

Control: plant D

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