An independent variable is the one that you change in the experiment.
A dependent variable is the one that you measure, it changes depending on the independent variable.
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Yes. The presumed cause is the independent variable and the presumed effect is the dependent varibale. Variablility in the dependent variable is presumed to depend on variablility in the independent variables. It is used more of a direction of influence rather than a cause and effect scenario. Ex. need for increased assistance is dependent on decrease in health. Health is the independent variable and assistance is the dependent.
80 is neither dependent nor independent. It is a number: a variable can be dependent or independent, not a constant.
Dependent and independent and what scenario
Free from outside control means Independent . While dependent Is opposite.
Independent changes; the dependent variable is what you will measure.