02_Hyp_Testing_Exp_Design - Todaysquestions I (reprise II....

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Hypothesis Testing and Experimental Design Today’s questions: I. What is the nature of science? (reprise) II. How can hypotheses be tested experimentally?
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I. What is the nature of science? (reprise) Some pseudoscience hypotheses: 1. Touching crystals can protect you against bad energy. 2. Certain types of behavior bring good luck. 3. Disease is caused by people wishing ill on others. Predictions: 1. If you enter X’s house and don’t touch crystals in a prescribed order bad things ill happen order, bad things will happen. 2. If you don’t change underwear during March madness, your favorite team is more likely to win. 3. If someone has cast a spell on you, a specific ceremony can counter the spell and maintain your health.
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Caveats… Problems with negative results: Wh t if l b li i th h i ? What if people believe in the mechanism?
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Scientific theories usually have a pattern component and a process component and a process component. The pattern component is a statement of fact— The pattern component is a statement of fact something that is The process component is a mechanism that
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f d h d In terms of pattern and process, why is pseudoscience considered “pseudo?” Pattern: Process:
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II. How can hypotheses be tested experimentally?
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  • Spring '09
  • BRADSHAW
  • Biology, Null hypothesis, physical conditions, Experiment Experiment, diet        Leaf diet, Flower diet        Leaf, hypothesis.  Null hypothesis

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