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Creating a Question

A good experimental question should be:

  • Interesting (the answer should not be obvious)
  • Testable (can be tested by an experiment)
  • Experimental (not a research question)
  • Doable (uses easy-to-get materials)
  • Measurable (something you can measure)
  • Safe (uses materials that can be used safely)

An experimental question is usually written like this: 

Does ________________ affect _______________ ? 
            (manipulated variable)               (responding variable) 

Here's an example of an experimental question:

Does the color of light affect how fast basil plants grow?

For more examples of experimental questions, click here.
To check if you understand the difference between good and bad experimental questions, try this quiz

You'll learn more about these variables in the next section of the manual.