Response to Dr. Bob
So in the investigation the sunlight would be the controlled variable. the water would be the dependant variable.From my previous question?
yes water is a dependent variable.
http://www.sciencebuddies.org/science-fair-projects/project_variables.shtml
Actually, in scientific investigations, the independent variable is the one that is intentionally manipulated or changed by the experimenter, while the dependent variable is the one that is being measured or observed to see if it changes as a result of the independent variable.
In the context of your previous question about the investigation, if you were investigating the effects of sunlight on plant growth, then the amount of sunlight the plants receive would be the independent variable. You would intentionally manipulate the amount of sunlight the plants are exposed to in order to see how it affects their growth.
On the other hand, the dependent variable in this case would be the plant growth itself. You would measure or observe the changes in plant growth as a result of different levels of sunlight exposure.
It's important to note that the controlled variable is a factor that is kept constant throughout the experiment to ensure that any observed changes can be attributed to the independent variable and not to other factors. In the case of your investigation, some potential controlled variables might include the type of plants used, the type and amount of soil, the temperature, and the amount of water, among others. These controlled variables are kept constant to isolate the effects of sunlight on plant growth.