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Why must an experiment or a survey be controlled? What is the difference between the control group and the experimental group in a controlled experiemnt?

Why must an experiment or a survey be controlled? What is the difference between the control group and the experimental group in a controlled experiemnt?
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Why must an experiment or a survey be controlled? What is the difference between the control group and the experimental group in a controlled experiemnt?

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User Takkun
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In tho control group everything is kept constant.
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User Kylef
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An experiment or survey must be controlled in order to receive accurate results.

In an experimental group, the independent variable is changed. But in the control group, the independent variable stays the same.
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User Malsmith
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