Scientific Investigation and Reasoning

Variables Independent Variable Dependent Variable Also called the manipulated variable Goes on the X-axis The one thing that is changed in an experiment Dependent Variable Also called the responding variable Goes on the Y-axis What is being measured or observed in the experiment

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. Independent Variable Amount of time exposed to UV light Dependent Variable Number of people who develop skin cancer

If leaf color change is related to temperature, then exposing plants to low temperatures will result in changes in leaf color. Independent Variable Temperature Dependent Variable Leaf color

If the speed of plant germination is related to the hardness of the hull of its seed, then softening the seed with water or a weakly acidic solution prior to planting will hasten germination. Independent Variable Amount of time in softening solution Dependent Variable Time is takes seed to germinate

How will this look on a graph? Independent Variable Amount of time in softening solution Dependent Variable Time is takes seed to germinate DRY MIX ependent variable esponding variable axis anipilated variable ndependent variable axis

How will this look on a graph? Independent Variable Amount of time in softening solution Dependent Variable Time is takes seed to germinate y Time to germinate x Time in solution