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The Scientific Method

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by

Erin Kreutzer

on 2 March 2014

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Transcript of The Scientific Method

Scientific Method
Collect Data
Plan an Investigation
Analyze, Draw Conclusions, and Report Results
The data must be
collected and recorded

Conduct an Investigation
examine data by looking closely for patterns
What do you want to ask?
Variable
A variable is a factor that you can change.
Independent Variable
It is a variable that is controlled and manipulated by the experimenter
Dependent Variable
Control Variable
It is the variable that is being tested and is 'dependent' on the independent variable
A variable that remains unchanged to allow for a comparison between the independent and dependent variable
Organize & Record Data
Analyze
Data can be organized in various ways like charts, graphs, and diagrams
Classify Objects
to write down orderly and neat information
Charts provide visual comparison of data
Graphs visually track
2 variables, usually showing changes over a period of time
Diagrams are labeled drawings that provide data
Charts
Graphs
Diagrams
Scientists use this data to make and support inferences.
Inference
a conclusion based on evidence or data
observe
data types
tools
units
to notice or study something closely
qualitative data: traits or qualities
quantitative data: quantity, or numbers
amount used as a standard
anything used to get something done
tool
unit
measures
data type
thermometer
degrees
temperature
quantitative
balance
grams,
ounces
mass
quantitative
stopwatch
seconds
time
quantitative
graduated
cylinder
milliliters
quantitative
volume,
liquid
meter stick
meter
quantitative
length
barometer
psi
quantitative
pressure
anemometer
km/h
quantitative
speed
classification
- grouping similar items together;
helps scientists compare and contrast and understand relationships
Ask a
testable question
about something you observe.
"If _______, then ________ will happen."
Hypothesis
State what you think the answer to your question is based on things you know.
Materials
list of the supplies and tools used in the experiment
Remember
example
Testable Question:
Hypothesis:
Materials:
Variables
Independent:
Dependent:
Controlled:
A
testable question
can be answered by taking measurements and making observations.
Scientific Method
processes scientists use to answer questions
* conducting the investigation
multiple times is a good idea

* more results =
more accurate data
A series of steps used by scientists to solve a problem or answer a question
If I mix blue and red paint, then I'll have purple paint.
Make a plan
* What steps will you take?
* What materials will you need?
* How much time do you need?

*Good investigations
test one thing at a time
to learn about red and blue paint, I would need: red paint, blue paint, a small bowl, and a paint brush to mix my colors
Different shades of red
Shades
of purple
Blue paint, paint brush, amount of red and blue paint
What color will I make if I mix red and blue paint together?
Control Group
Experimental
Group
Record
Scientists must write down everything they do in investigations in a
log book
so that the experiments can be duplicated.
examples: materials, procedures, results, observations
Procedures
*What will you do?
*When will you do it?
*Write out your procedure
first, then follow them.
*Be very clear and concise.
Objects or organisms in an experiment that are kept under normal conditions

example: the plant under
the white light
Objects or organisms that are experimented on

example: plant under green light
Make Comparisons
Oobleck! Is it a solid or a liquid?
Properties of Solids
no fixed shape - liquids flow
definite volume
takes the shape of its container

Properties of Liquids
does not flow easily
definite volume
fixed shape

Conclusion
Was your hypothesis correct? Explain why or why not. Use examples from your observations.
Let's investigate!
Rules:
Follow directions!!!
Keep your voices down
Listen to the teachers!
Keep your hands to yourself
If you break rules, you will have to stop participating and complete pages in your science textbook
Clean up your area when finished


decide what the data means
Interpret
Was your hypothesis correct?
Provide data to support your statement
Draw Conclusions
Scientists write up experiments to share results. They often read each other's papers and try to do the experiment themselves
a single, completed investigation
Trial
Do it again!
Full transcript