When trees become iron deficient, their leaves turn yellow prematurely. A botanist is testing iron doped fertilizers on maple trees with iron deficiencies. The botanist has selected 200 maple trees in the state of Wisconsin that have been identified as having an iron deficiency Half of the trees are randomly chosen to recieve the iron-doped fertilizer, while the other half are given a fertilizer without iron. The results from the test show that trees adminstered the iron doped fertilizer had fewer premature yellow leaves, indicating an increase in their iron levels. Which of the following statements best describes the results of the test?

Options

A. The iron-doped fertilizer will improve iron levels in any tree.
B. The iron-doped fertilizer reduces premature yellow leaves better than any other fertilizer
C. The iron-doped fertilizer will cause a significant increase in iron levels.
D. The iron-doped fertilizer will result in fewer premature yellow leaves in maple trees in Wisconsin.

Answer

D