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How would you design a controlled experiment?

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First answer by ID1129386686. Last edit by ID1129386686. Question popularity: 2 [recommend question].

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Why would a controlled experiment not be possible?
If the controlled experiment caused harm to humans (Not organisms such as bunny rabbits and dogs sadly) for example lets say i have a hypothesis that a factory chemical that was very dangerous had...
How many variables would you change in a controlled experiment?
You can only change ONE at a time. That's what makes it controlled. It's the only sure way to know what actually changed the experiment.
What is controlled experiment?
A controlled experiment is something that helps you control your experiment.
How do you design an experiment?
Experiments are used to test a hypothesis (idea). The first thing you need to do is work out what you want to demonstrate or show. After that there are so many millions of examples this question is...
How would you design an experiment to prove or disprove the hypothesis?
By testing your results, and explain in your conclusion what went wrong