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The Scientific Method

Thinking and working like a scientist.
by

Elizabeth Reynolds

on 14 October 2011

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Transcript of The Scientific Method

The Scientific Method
Experiment!
Problem
Hypothesis
5 steps to solve any problem
Conclusion
Does your data analysis support your hypothesis?
is written as a question
a logical answer to your question
What do you think will happen?
Design a process that will test your hypothesis
What will happen if I "water" a plant with orange juice?
must be written as an "if, then" statement
If I give this plant orange juice, then it will have faster growth than a plant given water.
What are variables?
something that can change or be changed
How to set up an experiment:
Set up 2 versions of your test, with EVERYTHING the same EXCEPT what you are testing.
Same type of plant
Same starting size
Same type of soil
Same location
Same amount of light
Only difference? One gets water, the other gets O.J.
Figure out what you can measure to prove your results. Plant height? Number of leaves? Root length?
Independent variable:
the factor that YOU (the experimenter) have changed between the two groups
the LIQUID (OJ or water)
Dependent variable:
the factor that you are measuring. It changes based on the independent variable
plant growth
Constants:
Factors that you do not allow to change.
plant species and size
soil type
location
amount of liquid given
amount of light
WHY?
so you know nothing will affect your results except what you're testing!
Experimental group:
plant that gets the changed factor, like orange juice
Control group:
plant that does not get the change, but maintains normal conditions, like water
Analysis
take a closer look at the data you gathered in the experiment
(this usually means graphing)
What does a graph need?
Title
Axis labels
Scale
Key (?)
Day
Plant height (cm)
0
2
4
6
8
10
12
14
2
4
6
8
10
0
Plant growth per day on water and orange juice
Key:
Plant with water
Plant with OJ
It is time to ACCEPT or REJECT your hypothesis and explain WHY.
"I reject my hypothesis, because the plant provided with orange juice experienced less growth than my control plant. I think I might like to try this experiment again with a greater variety of liquids."
Full transcript