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Experimental Design

Understand the fundamentals of experimental design with practical applications and examples, focusing on hypothesis, control, trial, independent variable, dependent variable, constant, and data table interpretation.

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Experimental Design

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  1. Experimental Design This concept will be integrated throughout the year – refer to these notes when needed (**Write just the underlined parts)

  2. HYPOTHESIS • Ex: #1 • Ex #2: • your prediction before you change a variable • IF __(IV)___, THEN __(DV)__. • If I add food coloring to the applesauce, then my students will choose…the colored applesauce over the regular applesauce. • If a paper clip is added to the nose of the plane, then it will fly farther. (or increasing the weight of the nose.

  3. Control • Ex:#1 • Ex #2: • an unchanged partofo the experiment (used in to detect the effects of hidden variables. • regular applesauce • the original plane you fly without paperclips.

  4. Trial: • Ex:#1 • Ex #2: • each time you do an experiment; each time you collect data. • each one of my students, 32 trials. • each time you throw the plane.

  5. Independent Variable: • Ex:#1 • Ex #2 • a variable is purposely changed in an experiment. • the color. • the number of paper clips.

  6. Dependent Variable: • Ex:#1 • Ex #2 • The thing you “meausure” because of the independent variable. • the “frequency” of the color that is chosen. • the distance.

  7. Constant • Ex:#1 • Ex #2 • all the factors that remain the same through out the experiment. • the type/amount of applesauce, the cup, portion, temperature… • the paper, size of paper clip, wind, throw, environmental conditions.

  8. Data Table • independent variable on the x-axis, • dependent variable on the y-axis.

  9. What type of graph????? The graph may look something like this-. Line and bar graph. Which one is correct? The bar graph is correct because the IV is non-numerical.

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