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 What makes a question testable?  It has variables  It is something we can measure.

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Presentation on theme: " What makes a question testable?  It has variables  It is something we can measure."— Presentation transcript:

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2  What makes a question testable?  It has variables  It is something we can measure

3  There are 3 kinds of variables in an experiment…  Manipulated variable: ▪ The thing you change  Responding variable: ▪ The thing you measure  Controlled variable: ▪ The things that stay the same

4  How much water flows through a faucet at different openings?  Manipulated Variable ▪ Water faucet opening (closed, half open, fully open)  Responding Variable ▪ Amount of water flowing measured in liters per minute

5  The Faucet  Water pressure, or how much the water is "pushing"

6  Does fertilizer make a plant grow bigger?  Manipulated Variable ▪ Amount of fertilizer (measured in grams)  Responding Variable ▪ Growth of the plant measured by its height ▪ Growth of the plant measured by the number of leaves ▪ Etc.

7  Same size pot for each plant  Same type of plant in each pot  Same type and amount of soil in each pot  Same amount of water and light  Make measurements of growth for each plant at the same time  Keeping all of these things the same tells us that the only thing that could have caused differences in plant growth was the fertilizer.


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