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Chapter 2 The Scientific Method
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develop or revise hypothesis
The Scientific Method STEP 5 testing more collection of new and different evidence STEP 4 theory attempt to describe a natural law STEP 3 testing through observation and experiments STEP 2 continually tested develop or revise hypothesis STEP 1 observation hypotheses are then tested against evidence of nature
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The Scientific Method The scientific method is based on evidence
Scientific evidence is: objective - the evidence describes exactly what happened and is free from bias or opinion repeatable - others get the same results looking at the evidence the same way
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The Scientific Method Hypothesis: a testable explanation or prediction
Theory: a human attempt to describe a natural law; supported by lots of evidence - Theories explain how or why Law: a theory that has been tested many times, by many different people, without any contradictions - Laws state scientific facts
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Hypotheses, Theories, and Laws
hypothesis May become theory if supported by evidence from repeated exp. May be supported by evidence, but is not a theory or law May be tested, validated, and result in stating a natural law A theory does NOT become a law; it attempts to explain a law A theory may be discarded or revised as new evidence is gathered Is simply a testable prediction Laws help scientists make more accurate predictions Laws are refined through further experiments
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