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Conducting Fair Experiments: A Guide to Valid Science Fair Projects

This guide helps students create fair tests for their science fair projects. By exploring questions like "How does fertilizer affect plant growth?" or "Which battery lasts longest?", students will learn to control variables such as plant type, soil, water, sunlight, and temperature. Emphasis is placed on using objective measurements with tools like thermometers, rulers, and timers to ensure valid results. This hands-on approach encourages students to design their own experiments and share their procedures, fostering a solid understanding of scientific principles.

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Conducting Fair Experiments: A Guide to Valid Science Fair Projects

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  1. Creating a “Fair” Test Practice with Variables

  2. Creating a “Fair” Test It’s science fair time in your classroom. Juanita’s question is, “How does fertilizer affect the growth of plants?” What steps could Juanita take to ensure her experiment produces valid results?

  3. Creating a “Fair” Test What name can we use to describe those things you identified as important to consider if Juanita is to conduct a “fair” test? • Plant variety / size / age • Soil • Water • Sunlight • Temperature • Pot

  4. What is gained by controlling variables? The results are meaningful. Can establish cause and effect! Fertilizer Amount 1 Plant Fertilizer Amount 2 Fertilizer Amount 3

  5. Creating a “Fair” Test It’s science fair time in your classroom. Spencer’s question is, “What brand of battery lasts longest?” What steps could Spencer take to ensure his experiment produces valid results?

  6. Now it’s your turn! • Create a question. • Design a procedure that will result in a “fair” test • Be prepared to share your procedure with the class.

  7. Objective / Subjective • What are subjective measurements? • What are objective measurements? • What tools support objective measurements? Thermometer Ruler / tape measure Balance / scale Measuring cups / spoons / graduated cylinder Stop watch / timer / clock

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