Shadowing Practice: Experimental Variables - Learn English Speaking with Video
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A student wants to find out whether the amount of light a plant receives affects how tall it grows.
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She sets up three identical potted plants, one in normal sunlight, one under a bright grow lamp,
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and one in a dark cupboard.
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you you Thank you.
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But to get a reliable answer, she needs to design this experiment carefully.
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She needs to understand three types of variables.
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The first is the independent variable.
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This is the one thing she deliberately changes, the cause she's testing.
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Here, that's the amount of light.
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She's testing three levels: normal, Hi and None you An easy way to remember it I change it.
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I for independent, I.
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The second is the dependent variable.
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This is what she measures, the result.
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Here, that's the height of each plant, measured in centimeters after a set number of weeks.
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She doesn't control this value.
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She simply records what happens.
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An easy way to remember, it gives you your data.
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D for dependent, D for data.
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you The third is the controlled variables.
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These are everything else that must stay exactly the same to keep the test fair.
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She uses the same pot size, the same soil, and gives each plant the same amount of water.
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If she gave one plant more water than the others, she wouldn't know whether it was the light or the extra water that caused any difference in growth.
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An easy way to remember: keep it fair.
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Change one thing, measure one thing, keep everything else the same.
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you That's what makes an experiment fair, and that's how scientists find out what really causes what.
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