You want to determine the effect of a certain fertilizer on the growth of orchids grown in a greenhouse. Materials that are available to you include: greenhouse, 100 orchid plants, water, fertilizer, and soil. You want to know if the orchids will grow best with a weak concentration of fertilizer, a medium concentration of fertilizer, or a high concentration of fertilizer. (Concentration means how strong the fertilizer is.)
After one month of measuring the orchids, the following data is obtained:
Group 1 (Control Group): Grew to an average height of 15 cm.
Group 2 (Weak concentration): Grew to an average height of 35 cm.
Group 3 (Medium concentration): Grew to an average height of 28 cm.
Group 4 (High concentration): Grew to an average height of 10 cm.
