Independent versus Dependent Variable Worksheet
Independent versus Dependent VariableAn independent variable is the one thing you intend to vary in an experiment, “what’s being tested”A dependent variable is the thing that will change that you intend to measure at the end, “what do you want the results to be”In the following examples identify the independent and dependent variables and then also list several potential confounding variables that the experimenters would have to consider.Sample Hypotheses1. If skin cancer is related to ultraviolet light, then people with a high exposure to UV light will have a higher frequency of skin cancer. What will you do to test this proposal? What will you vary or change? What will you measure?Independent variable – UV LightDependent variable – Higher exposer to UV light will cause a higher frequency of skin cancer2. If leaf color change is related to temperature, then exposing plants to low temperatures will result in changes in leaf color. Independent variable – plantsDependent variable - change in leaf color4. If photosynthesis is related to light energy, then the portions of a leaf shaded from light will test negative for starch, since starch is a product of photosynthesis. Independent variable – leafDependent variable – test negative for starch5. If animal metabolism is related to temperature, then increasing resting room temperature will increase animal metabolism (as measured by carbon dioxide gas production which is one of the waste products of animal metabolism).Independent variable – animal metabolismDependent variable – Increase of metabolism based on the increase resting room temp ................
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