scientific method (biology a)
DESCRIPTION
scientific method powerpoint to follow for Miss Basch BiologyTRANSCRIPT
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Scientific Method
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Steps in the Scientific Method
■ Observe & Question
■ Hypothesis■ Experiment■ Data Collection■ Conclusion■ Retest
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Observations
■Gathered through your senses
■A scientist notices
something in their natural
world
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Observations
■ An example of an observation
might be noticing that
many salamanders near a pond have curved, not straight,
tails
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Hypothesis
■ A suggested solution to the problem.
■ Must be testable■ Written as If…
Then… statements■ Predicts an outcome
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Hypothesis
■ An example of a hypothesis might be that the salamanders have curved tails due to a pollutant in the moist soil where they live.
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Experiment
■A procedure to test the hypothesis
.
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Experiment
Variable – factor in the
experiment that is being
tested
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Experiment
A good or “valid”
experiment will only have
ONE independent
variable!
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Scientific Experiments Follow Rules
■ An experimenter changes one factor and observes or measures what happens.
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Independent and Dependent Variables
■The factor that is changed is known as the independent variable. (manipulated variable)
■“I change the independent variable”
■The factor that is measured or observed is called the dependent variable. (response variable)
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Controlled Variables/Constants
■The experimenter makes a special effort to keep other factors constant so that they will not affect the outcome.
■ Those factors are called controlled variables or constants.
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What is the Purpose of a Control Group?
■The control group is the “normal” situation of the independent variable
■The Control are used for COMPARISON
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Example of Controls & Variables
■ For example, suppose you want to figure out the fastest route to walk home from school.
■ You will try several different routes and time how long it takes you to get home by each one.
■ Since you are only interested in finding a route that is fastest for you, you will do the walking yourself.
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What are the Variables in Your Experiment?
■ Varying the route is the independent variable
■ The time it takes is the dependent variable
■ Keeping the same walker throughout makes the walker a control variable.
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One more thing… it is best to make several trials with each independent variable.
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Valid Experiments
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Remember: To be a Valid Experiment:
■ Two groups are required --- the control & experimental groups
■ There should be only one variable
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Data■ Results of
the experiment
■ May be quantitative (numbers) or qualitative
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Data■ Must be
organized■ Can be
organized into charts, tables, or graphs
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Conclusion
■ The answer to the hypothesis based on the data obtained from the experiment
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Retest
In order to verify the results,
experiments must be retested.
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Summary
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Solving a Problem1)Identify a Problem2) State Observations
about the problem3) Form a Hypothesis
about the problem (if…then…)
4) Design an Experiment to test the hypothesis
5) Collect Data6) Form a Conclusion7) Retest