Lecture 2 - Intro to NS - Remove rabbits experiment Grass...

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Remove rabbits -- experiment
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Grass grows here.
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Correlation is not causation. Surveys (correlation) Experiments
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Nature of Scientific Knowledge A single test can’t prove a hypothesis In fact, hypotheses can’t be “proved’ at all!
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It is provisional--science is always open to revision A continuum from very high probability of being true to being false Science is self-correcting
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Scientific fact A hypothesis with so much supporting evidence that it is believed true e.g., gravity causes objects to fall Some facts don’t stand the test of time
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What is a scientific theory?
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a statement of what are known to be general laws, principles, or causes of something known or observed. OED Theory
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Hypothesis vs. Theory Hypothesis has a narrow explanatory scope Theory has a very broad explanatory scope
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In everyday use “theory” is an untested hypothesis In science “theory” is a much supported hypothesis with a wide range of explanatory and predictive power e.g., theory of gravity, cell theory
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What is meant by “evolution is just a theory”?
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Scientific theory is Broadly explanatory Broadly predictive Much supported hypothesis = fact
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Can hypotheses and theories be disproved?
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