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"How to think, not what to think"
The Scientific Method
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The scientific method is an orderly and systematic
approach to solving problems. It can be used to solve both scientific and everyday problems.
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Steps of the Scientific Method
Observation Develop a question Form a hypothesis Perform an experiment-analyze data Draw a conclusion
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An everyday problem…. Rob needs a new girlfriend.
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He starts thinking about who his new girlfriend should be…
He’s developing a question.
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He hypothesizes that Emma Watson would be an excellent choice.
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To test his hypothesis , he performed an experiment by asking Emma
Dear Emma I really like you. Will you go out with me this Friday? Love, Rob Circle One: Yes, No, or Maybe To test his hypothesis , he performed an experiment by asking Emma out on Friday
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Dear Rob I would love to go out with you on Friday! Emma After analyzing the results of his experiment, he concluded that his hypothesis was correct.
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Additional Terms: Variable- factor being tested
Independent Variable = What the investigator manipulates; the particular treatment or condition the investigator is most interested in the effects of Dependent Variable = What is measured or observed; the "data" collected in the experiment Experimental Group = Those participants exposed to the independent variable Control Group = Those participants treated just like the experimental group EXCEPT they are not exposed to the independent variable; the group with which the experimental group can be compared –the factor that responds in a predictable way
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Describes how nature behaves but does not explain why nature behaves in that particular way It is generally accepted to be true and can sometimes be expressed in terms of a single mathematical equation. Scientific laws are similar to mathematical postulates. They don’t really need any complex external proofs; they are accepted at face value based upon the fact that they have always been observed to be true. Natural Law Example: Newton’s Laws of Motion
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Explains why nature behaves in the way described by a natural law
Theory: A theory is more like a scientific law than a hypothesis. A theory is an explanation of a set of related observations or events based upon proven hypotheses and verified multiple times by detached groups of researchers. One scientist cannot create a theory; he can only create a hypothesis. Theory Example: Einstein’s Theory of Relativity
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