Final answer:
The dependent variable is measured continuously in an experiment to observe its response to the independent variable, which is manipulated or controlled by the researcher.
Step-by-step explanation:
In an experiment, the dependent variable is the variable that is measured. It changes in response to the manipulation of the independent variable, which is the variable that researchers manipulate or control. While control variables are kept constant to prevent them from affecting the dependent variable, the dependent variable itself is not held constant but is rather measured to see the effects of the independent variable. The dependent variable is measured continuously throughout the experiment to assess change or variation in response to different levels of the independent variable. In the context of an experimental study, after applying different treatments to the groups and ensuring no other factors are affecting the results, any change observed in the dependent variable can be attributed to the manipulation of the independent variable, thereby establishing a cause-and-effect relationship.