Lecture 2- Experimental Design/Scientific Process

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Biology 171

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8 Terms

1
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What is the definition of a Hypothesis

It is a testable, possible explanation for a natural phenomenon used to make predictions and motivate experiments, they are falsifiable

2
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A prediction comes before or after a hypothesis?

After

3
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Correlation is ___ Causation

NOT

4
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What are the 3 characteristics of a well controlled experiment

  • Alters only a single variable in the test-group

  • Contains a negative control that is not changed

  • Contains a positive control where a variable with a known effect is introduced (miracle grow)

5
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What is the def of a Theory

Theories are overarching explanations that explain broad patterns in nature and are based on lots of evidence and has been tested by many people and are well supported.

6
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What are 4 things that make a good experimental design

  • Can be replicated and repeated

  • ethical

  • only manipulating one variable at a time

  • large sample size

7
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Why isnt there a negative control in medical treatments

Because it is unethical to withhold treatment from a person

8
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