1. Scientific Investigation and Reasoning

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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