1. Objectives Outline the main steps in the scientific method
List the elements of a controlled experiment

2. The Tools of Science The Scientific Method
General steps in the scientific method
Observe (question)
Hypothesis (prediction)
Testing/Experimentation
Analyze
Repeat the test or devise a new one
Report

3. Observation
You notice that these plants are not the same size.
Collect some data.

4. Hypothesis
Full Sun
Shade
Hypothesis: An educated guess that attempts to answer the question at hand
If plants are in full sunlight then they grow taller because they can photosynthesize more.

5. Develop ways to test your hypothesis. Controlled experiment
The only factor that will change. In this case; light.
All other factors are the same; soil, moisture, fertilizer, etc.
Controlled Light
Develop ways to test your hypothesis.
Controlled experiment
Determine the independent variable (what you are changing)

6. All variables remain constant. Experimental group
Results from the experimental group will be compared to the control group
Shade, no direct light
More Controlled Light
Control.
Less controlled light
Control group
All variables remain constant.
Experimental group
The group where the independent variable is changed

7. Any changes that resulted from manipulating the independent variable
Experiment
Shade, no direct light
More Controlled Light
Control.
Less controlled light
Dependent variable
Any changes that resulted from manipulating the independent variable
Portion of experiment you can measure. Ex. Height of plant

8. Variables Independent variable (changing)
Amount of light
Dependent variable (can measure)
Growth of plant
Experimental group
Plants in full sunlight
Control group
Plants in partial sunlight

9. Data- Collect information, typically in the form of a chart to show what was measured in the experiment.
Height of plant (cm)
Days
Full
sunlight
Part 1
4 cm 4
6 cm
5 cm 7
7 cm 10
8 cm 13
10 cm

10. Analysis
Analyze your data. If you had statistical data you collected, you would show results in a graph.
Dependent variable (what is being measured) – y axis
Independent variable (what is being changed) – x axis

11. Guess what I found out!?... Conclusion
Conclusion: Simply state whether or not your data supports your hypothesis.
Ex. “Based upon the results of my experiment “