The independent variable, the one that is intentionally manipulated between the two samples, is the mass of the each sample. there is also another variable that is manipulated This independent variable is the type of material used. In each case, the dependent variable, temperature.
Two dry sand sample are examined by changing one parameter. so, the independent variable, the one that is intentially changed between two samples is the mass of the each sample.
Besides the amount of material, there is also another variable that is manipulated within each of the two mass groups and represented as three types. This independent variable is the type of the material used.
In each case, the dependent variable, the one that you measure the response in, is the temperature over the time.
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