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Time is often an independent variable.
the dependent variable changes with the independent variable. the independent variable only changes when changed by the experimenter. Time is usually an independent variable.
Time is the independent variable.
An independent variable is a factor that doesn't rely on anything, unlike the dependent variable (which relies on the independent variable). The most common independent variable is time.
Each time the independent variable is changed, the dependent variable is measured. If the independent variable is time, the experimenter chooses an appropriate interval between measurements. This same methodology is used whenever the independent variable is not something the experimenter actually has in his control.