Experimental Design

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8 Terms

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What are the seven steps in the scientific method?

  1. Observe/Questions

  2. Background Research

  3. Form a hypothesis

  4. Collaborate

  5. Design and perform an experiment

  6. Gather and Analyze Data

  7. Form conclusions

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Hypothesis 

Identify a specific and testable explanation for some phenomenon. An educated guess.

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Null Hypothesis 

The opposite of your hypothesis.

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Independent variable

The factor that you are manipulating or testing (difference between control and experimental groups)

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Dependent variable

The factor that is measured or expected to change from the independent variable

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Control

Group that does not receive any treatment or is not manipulated. Typically a baseline or natural state of something.

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Experimental

The group that is being manipulated or is receiving a particular treatment.

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Variability/Repetition

Sample size: The number of individuals being tested in the experiment

– Statistics:  Helps you determine if the results are you are seeing are random events or valid results due to your manipulation

– Repeatability: Is your experiment designed and written in a way that it can be repeated to show the same results  (by you and others)?