Mangroves are highly threatened by local extinction due to habitat destruction and land reclamation in Hong Kong. A group of scientists is implementing a pilot project to assess the effect of growing seeds of these plants in different substratum evaluating the influence on the height of plants. Using a greenhouse experiment, scientists set 3 experimental treatments, each treatment with 5 replicates (N=15). Fivewere filled with sandy soil, 5 were filled with loamy soil, 5 were filled with a peat-based substrate. A single seedling was planted in each pot and grown for 8 weeks. Plant heights were then measured at the end of the experiment. The question is whether the height of the plants differed among groups as a function of the substrate.

Plant heights were (cm):

Sandy Soil: 15, 16, 18, 15, 21

Loamy Soil: 21, 20, 18, 25, 26

Peat: 22, 26, 27, 30, 29

What is the F value for this experiment?

Answer: