Dependent and independent variables. ... The dependent variables represent the output or outcome whose variation is being studied. The independent variables, also known in a statistical context as regressors, represent inputs or causes, that is, potential reasons for variation.
An independent variable is a variable that is manipulated to determine the value of a dependent variable s. The dependent variable is what is being measured in an experiment or evaluated in a mathematical equation and the independent variables are the inputs to that measurement.
The independent input is the cost of each necklace because you can buy a lot of jewerly and have the cost multiplied by how much they are going to buy. But the $6 of shipping is the dependent because you can as many jewerly as you want but the shipping amount multiplies depending on how much jewerly the person will buy.