![]() Here, the amount of chemical would be the independent variable and the rat health would be the dependent variable. ![]() If you determine the substance is necessary for proper nutrition, a follow-up experiment might determine how much of the chemical is needed. ![]() The health of the rat (whether it lives and can reproduce) is the dependent variable. The presence/absence of the chemical is the independent variable. You want to determine whether a chemical is essential for rat nutrition, so you design an experiment.How hungry you are would be the dependent variable. If you want to know whether caffeine affects your appetite, the presence/absence of a given amount of caffeine would be the independent variable.In an experiment to determine how far people can see into the infrared part of the spectrum, the wavelength of light is the independent variable and whether the light is observed (the response) is the dependent variable.The dependent variable would be the amount of liquid absorbed by the paper towel. The independent variable in your experiment would be the brand of paper towel. You want to compare brands of paper towels, to see which holds the most liquid. ![]()
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