Tip #4: The hypothesis must address the manipulated
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The cause and effect in your hypothesis are related to the manipulated and responding variables in your question. For example, look at this question: "How does the type of music affect a plant's growth?" The type of music can be changed intentionally, so it is the manipulated variable. The plant's growth may change as a result of the type of music, so it is the responding variable. Your hypothesis must include an MV and RV: "I think that if a plant is exposed to classical music (MV), then it will grow very fast (RV)."
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