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There can only be one independent and one dependent variable. All other variables should be classed as control variables and must be kept constant to achieve a fair test.
We consider correlation as a several independent variables.
Independent variable is the one to be investigated; the one that will be changed to get results. If you are still finding it too hard just keep this in your mind-- Independent variables answer the question "What do I change?" in an experiment. Dependent variables answer the question "What do I observe?"!
Independent on the x-axis (horizontal) and dependent on the y-axis (vertical).
It depends on the relationship, if any, between the independent and dependent variables.