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.[1]
| 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 |