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The independent variable is the cause. Its value is independent of other variables in your study. The dependent variable is the effect. Its value depends on changes in the independent variable.
The independent variable, as indicated in the name is not influenced by other variables but can predetermine its own self.
So, the independent variable is the water in the 200 gallon aquarium
Now, the dependent variable is the tested variable and is depends on the independent variable, which is the time it takes to drain the 200 gallon aquarium.
Hence, independent variable is volume of water in the aquarium and dependent variable is time it will take to drain the aquarium.
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