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Scientific Method

This presentation provides the steps of a general scientific method with descriptions and examples.
by

Rayna Krevitsky

on 1 September 2015

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Transcript of Scientific Method

Problem/Question
Gather information
Form hypothesis
Test hypothesis
Analyze data
Conclusion
Hypothesis
supported

Hypothesis
not supported

Observe an event in nature and ask a "why" or "how" question about why or how it occurs.
How does water flow on a slope?
Learn about the problem by researching what others have done.
Find articles about the research others have done on how water flows, the properties of water, and slopes.
Write a possible explanation for the problem using what you know.
If water is poured on a slope, then the water will flow down the slope because gravity will pull it down.
Make observations or perform an experiment to test the hypothesis.
Pour one liter of water on a board sloped at varying angles. Record where the water flows with each trial.
Important Vocabulary in Experiments
variable-

a quantity that changes in an experiment
dependent variable-
a variable that changes according to changes in other variables
independent variable-

a variable that you change in an experiment
constant-

a factor that does not change in an experiment
control-

a standard to compare test results to
Interpret the data and analyze the observations by creating tables, charts, and graphs.
Create a table of all angles of the board and the direction the water flowed for each.
Based on the analysis of the data, decide whether or not the hypothesis is supported.
Since in every trial, the water did not flow upward, the hypothesis is not supported.
Repeat several times
Modify hypothesis
If the data does not support the hypothesis, you must reconsider the hypothesis. You might need to modify the hypothesis or conduct the experiment differently.
In order to be widely accepted, the experiment must result in the same data every time it is repeated.
A Scientific Method
What do you expect the data to show in our example?
How would you interpret the data if it shows that the water flowed up the slope?
When the scientist's expectations change how the results are viewed a
bias
occurs.
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