Experimental Design Diagram

Title:     The Effect of Different Aged Compost on Bean Plant Growth 

Independent Variable:  Age of Compost

3 month-old compost

25 Plants

25 Plants

25 Plants

6 month-old compost

No compost (control

Hypothesis:  If older compost is applied, then plant growth will be increased.

Dependent Variable:  Height of Plants (cm)

Constants:  Amount of light

              Amount of water

                    Amount of compost

• Based upon a rectangle.
  

• Independent Variable:  written across top of rectangle that is divided into labeled columns to represent different levels of the independent variable.
  

• Number of trials is indicated in each column.
  

• Dependent variable and constants are also included in the rectangle.
  

• An appropriate experimental title and hypothesis are written above experimental design diagram.