Experimental design diagram

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Experimental Design Diagram (EDD) is a diagram used in science to design an experiment. This diagram helps to identify the essential components of an experiment. It includes a title, the research hypothesis and null hypothesis, the independent variable, the levels of the independent variable, the number of trials, the dependent variable, the operational definition of the dependent variable and the constants.

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Title	The Effect of Different-Aged Compost on Bean Growth
Hypothesis	If older compost is applied, then plant growth will be increased, because....
Independent Variable	Age of Compost
Levels of IV	3-month-old Compost	6-month-old compost	No compost
Repeated Trials	25 plants	25 plants	25 plants
Dependent Variable	Height of Plants (cm)
Constants	Amount of light; Amount of water; Amount of compost

Students and Research: Practical Strategies for Science Classrooms and Competitions, 3rd Edition, by Cothron, Giese, & Rezba (2000). Kendall/Hunt Publishing