2. What is the scientific
method?
It is a logical, systematic approach to solve
a problem
The scientific method is a set of steps used
by the scientific community to organize
thoughts in order to solve or investigate
problems.
3. The Steps of the
scientific method
1. Identify the problem and make observation
2. Form a hypothesis
3. Design an experiment
4. Test your hypothesis (conduct experiment)
5. Draw conclusions
4. Step 1
Identify the problem
This is always the first step
Ask yourself,
What am I trying to figure out in this investigation?
What can I learn through my Observations?
Observation is made by using your senses
Sight, smell, touch, taste, hearing
Problem should be related to observation that
you or someone else can make during the
investigation.
The problem is written in the form of a question.
6. Gather information
Gather information related to the question
Use the “need to know” to get you started
Research, Research, Research !!!!
This step could answer the question for you or
make you realize that this question is not
appropriate for scientific study
7. Where do we go from
here?
Once we know the problem, then we have to
look at gathering information to support our
problem.
Ask yourself two questions….
What do we
know already?
Think of five to
ten things you
already know
about your
problem.
What do we
need to know?
Now what
are five to ten
things you
need to find
out?
8. Let’s do it together
What I know
Plants need water to
grow
The water has different
pH levels
The plants need
sunlight
The plants need the
same temperature
All of the plants are the
same.
What I need to find out
What is pH?
What is the difference
in a level 2, 7 and 9 on a
pH scale?
How much water
should I give each day?
What temperature does
the plants need to be
placed in for them to
grow?
How much sunlight do
I need?
9. Form a
hypothesis
Form a hypothesis based upon the research
and/or previous knowledge.
Remember:
A good hypothesis is one that you can test
A hypothesis is a possible answer to your
question
A hypothesis is always in the form of a
statement, never a question (you already have
one)
It is usually in the form of IF….Then….Because
10. How do I write a
Hypothesis?
A hypothesis is written in an (if…then...because…)
statement
If…tells what you did in the experiment (verb)
Then….tells the action what happen next (reaction)
Because…..Explanation of the reaction
“If………, then………because…..” statement
Example:
If I flip the light switch to on then the light will come on
because the switch allows power to go to the light.
11. Quick Example
Title: The effect of pH on pansy
growth
Problem: Will a plant grow with
too much acid in the water?
Hypothesis:
If pansies receive water below pH of
7, then they will not grow because
the acid in the water will kill the
flower.
12. Design an experiment
Why Design an experiment?
Design an experiment to test your hypothesis
WAIT…Look at this
first
If this impossible, then you do not have a good
hypothesis
Go back to step 2 (forming a hypothesis)
If it is possible, then Keep going……
13. Materials
What do you need to perform this problem?
Use list or bullets (it is easer to read)
14. Quick Example
Title: The effect of pH on pansy growth
Problem: Will a plant grow with too
much acid in the water?
Hypothesis:
If pansies receive water below pH of 7, then they
will not grow because the acid in the water
will kill the flower.
Materials:
27 of the same flowers
27 pots of the same size
Measuring cup
Water source
Measuring tape
Pen and paper
15. Parts of an experiment
Control
Constant
Variables
Independent
Dependent
Replication (repeating the experiment MANY
Times
16. Control
Every experiment must have a control group
that will be used for comparison with one or
more experimental groups
17. Constants
The constants are the things that are will stay
the same in the control and experimental
group.
The control is identical to the experimental
group in all aspects but one variable that is
being studied
18. Variables
The variables are the things that change during
the experiment.
The variable that is being manipulated by the
experimenter is called the independent
variable
The thing that changes in reaction to the
independent variable is the dependent variable
Both variables are often found in the title and
hypothesis.
19. Data Collection
(results)
Make observations and collect data
This involves taking notes, measurements, as you are
conducting your experiment
Descriptive or qualitative data uses written descriptions of what
is observed.
Numerical or quantitative data uses measurement that can be
recorded in a table or chart
Most data gathering should include both descriptive
(qualitative) and numerical (quantitative) data
20. Gather data
*measure each plants
height daily
*place data in tables, graphs
Day1 Day2 Day3
pH2
pH7
pH8
21. Analyze data
What is the data telling you?
This occurs when experiment is over
Data and observations already made are now
analyzed to determine cause and effect
Numerical data from the table or chart is placed
in a graph
All results must be backed up with data from the
experiment
23. Form a conclusion
Was the hypothesis supported by the data?
Explain why or why not
Is more data needed?
Explain why or what data is needed
Should a new hypothesis be made and
tested?
Explain why a new hypothesis is needed
Does the data lead to more questions that
can be explored or tested?
What are the questions and why
Did some problem contaminate the data?
Explain what happen
Should be experiment be repeated?
Why do you feel it should or should not
