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If none of the variables are constant (or controls) you have no idea which variable or combination of variables caused the effect.
Because there is no way to know what effects the other key variables are having on outcome. So, there is no way to evaluate any one variable, or its effects on outcome.
variables. you need to find variables in Algebra cause that's what its all about. just keep doing problems over and over until you understand. it probably doesnt come easy for most people.
Every time the independent variables change, the dependent variables change.Dependent variables cannot change if the independent variables didn't change.