What are Dependent Variables?
Dependent variables are observable phenomena which are influenced by other phenomena. In an example, for someone studying how much light impacts the growth rate of plants, growth rate is the dependent variable, because it depends on how much light the plants receive. When people design experiments, they identify the dependent variable or dependent variables at the start, so that they can measure them throughout the experiment. They also identify all of the factors which can influence the dependent variable, to the best of their ability.