The relationship between the resistance and carbon proportion was expected to be a decreasing function, as carbon is a more effective conductor than clay, given the assumption that clay acts as an insulator. Thus an increase in carbon would lead to a decrease in resistance. Given this relationship, it would be expected that as the concentration of carbon approached zero, the resistance would approach infinity. Similarly, it was expected that as the percentage of carbon increased, the resistance would approach zero, levelling out at the resistance of pure graphite. Thus, it was expected that the model would most closely model an inverse function,