I can make changes to this variable. This is the only thing that should be changed in an experiment. It is like the cause in cause and effect. To find the IV, I can ask, "What am I changing?" Which vocabulary term is it.?

The correct answer is "categorical or discrete".

Explanation:

Categorical or discrete outputs are relatively easy to predict and classifying problems aid to do it so. Categorical outputs are not numeric outputs that do not follow any particular order, while discrete outputs are  responses that can be counted because they are expressed in integer numbers. More complex responses expressed in continuous outputs need further calculations.