Define dependant independant and controlled variable please?

The terms ';dependent variable'; and ';independent variable'; are used in similar but subtly different ways in mathematics and statistics as part of the standard terminology in those subjects. They are used to distinguish between two types of quantities being considered, separating them into those available at the start of a process and those being created by it, where the latter (dependent variables) are dependent on the former (independent variables).





The independent (or manipulated) variable is something that the experimenter purposely changes or varies over the course of the investigation. The dependent (or responding) variable is the one that is observed and likely changes in response to the independent variable.











For example, a student might change the position of a plane鈥檚 wing to see how it affects the average speed of a model plane. The wing position would be the independent variable- because the student purposely changes its location. The average speed would be the dependent variable since the average speed would depend on the location of the wing.








When conducting an experiment, all other variables must be kept the same throughout the investigation; they should be controlled. The variables that are not changed are called controlled variables.