The document outlines the steps of the scientific method and provides an example of a student, John, applying the scientific method to investigate how the amount of sugar affects the rising of bread. John develops a question about sugar's effect, researches baking and fermentation, formulates the hypothesis that more sugar will cause higher rising, designs an experiment to test varying sugar amounts while controlling other factors, collects and analyzes the resulting data, draws a conclusion, then communicates his findings.
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8. Steps of the
Scientific Method
3. Formulate a HypothesisFormulate a Hypothesis:
Predict a possible answer to
the problem or question.
Example: If soil temperatures
rise, then plant growth will
increase.
9. Steps of the
Scientific Method
4. ExperimentExperiment: Develop and
follow a procedure.
Include a detailed materials list.
The outcome must be
measurable (quantifiable).
10. Steps of the
Scientific Method
5. Collect and Analyze ResultsCollect and Analyze Results:
Modify the procedure if
needed.
Confirm the results by retesting.
Include tables, graphs, and
photographs.
11. Steps of the
Scientific Method
6. ConclusionConclusion: Include a
statement that accepts or
rejects the hypothesis.
Make recommendations for
further study and possible
improvements to the
procedure.
12. Steps of the
Scientific Method
7. Communicate the ResultsCommunicate the Results: Be
prepared to present the project
to an audience.
Expect questions from the
audience.
13. Think you can name allThink you can name all
seven steps?seven steps?
Problem/QuestionProblem/QuestionObservation/ResearchObservation/ResearchFormulate a HypothesisFormulate a HypothesisExperimentExperimentCollect and Analyze ResultsCollect and Analyze ResultsConclusionConclusionCommunicate the ResultsCommunicate the Results
14. Let’s put our knowledge of the
Scientific Method to a realistic
example that includes some of the
terms you’ll be needing to use and
understand.
17. Caution!
Be careful how you use effect and
affect.
Effect is usually a noun and affect, a
verb.
“ The effect of sugar amounts on the
rising of bread.”
“How does sugar affect the rising of
bread?”
18. Observation/Research
John researches the
areas of baking and
fermentation and tries
to come up with a way
to test his question.
He keeps all of his
information on this
topic in a journal.
19. John talks with his
teacher and she gives
him a Experimental
Design Diagram to
help him set up his
investigation.
20.
21. Formulate a Hypothesis
After talking with his
teacher and
conducting further
research, he comes
up with a hypothesis.
“If more sugar is added,
then the bread will rise
higher.”
22. Hypothesis
The hypothesis is an educated
guess about the relationship
between the independent and
dependent variables.
Note: These variables will be
defined in the next few slides.
23. Do you know the differenceDo you know the difference
between the independentbetween the independent
and dependent variables?and dependent variables?
24. Independent Variable
The independent, or
manipulated variable, is a factor
that’s intentionally varied by the
experimenter.
John is going to use 25g., 50g.,
100g., 250g., 500g. of sugar in
his experiment.
25. Dependent Variable
The dependent, or responding
variable, is the factor that may
change as a result of changes
made in the independent
variable.
In this case, it would be the size
of the loaf of bread.
26. Experiment
His teacher helps him
come up with a
procedure and list of
needed materials.
She discusses with
John how to
determine the control
group.
27. Control Group
In a scientific experiment, the
control is the group that serves
as the standard of comparison.
The control group may be a “no
treatment" or an “experimenter
selected” group.
28. Control Group
The control group is exposed to
the same conditions as the
experimental group, except for
the variable being tested.
All experiments should have a
control group.
29. Control Group
Because his grandmother
always used 50g. of sugar in
her recipe, John is going to use
that amount in his control
group.
30. Constants
John’s teacher reminds
him to keep all other
factors the same so
that any observed
changes in the bread
can be attributed to
the variation in the
amount of sugar.
31. Constants
The constants in an
experiment are all the
factors that the
experimenter attempts
to keep the same.
32. Can you think of someCan you think of some
constants for thisconstants for this
experiment?experiment?
33. Constants
They might include:
Other ingredients to the
bread recipe, oven used,
rise time, brand of
ingredients, cooking time,
type of pan used, air
temperature and humidity
where the bread was
rising, oven temperature,
age of the yeast…
34. Experiment
John writes out his
procedure for his
experiment along with
a materials list in his
journal. He has both of
these checked by his
teacher where she
checks for any safety
concerns.
35. Trials
Trials refer to replicate
groups that are exposed
to the same conditions
in an experiment.
John is going to test each
sugar variable 3 times.
36. Collect and Analyze Results
John comes up with
a table he can use
to record his data.
John gets all his
materials together
and carries out his
experiment.
37. Size of Baked Bread (LxWxH) cm3
Amt. of
Sugar (g.)
1 2 3 AverageAverage
Size (cmSize (cm33
))
25 768 744 761 758
50 1296 1188 1296 1260
100 1188 1080 1080 1116
250 672 576 588 612
500 432 504 360 432
Size of Bread Loaf (cmSize of Bread Loaf (cm33
))
TrialsTrials
Control group
38. Collect and Analyze Results
John examines his
data and notices that
his control worked
the best in this
experiment, but not
significantly better
than 100g. of sugar.