Question 17 (2 points) Concern over the loss of local biodiversity has increased

Question

Question 17 (2 points) Concern over the loss of local biodiversity has increased the urgency of understanding its consequences for ecosystem function in many habitats. Researchers compared the effect of intertidal seaweed species richness (monoculture vs. polyculture) and species identity (Cladophora, Endocladia, Mastocarpus, and Pelvetiopsis) on biomass accumulation in a mesocosm experiment. At the end of the experiment, they compared the proportional change in biomass among treatment groups (richness: F1 ,141 = 0.001, p = 0.870; identity: F3, 14,-57.4, p

Explanation / Answer

19. Answer a: Chi shi square test is used for measuring change in proportion of data to each other. Here in this experiment the change in proportion of biomass is measured between different treatment groups so chi shi square test is most appropriate for evaluating the data.

20. Answer a: Multiple independent analysis is used there are many variables in the data. Since there are variables like species richness, species indentity and their interaction. So multiple independent variables analysis is best for the data.

21. Answer a. Null hypothesis is that which the experimenter try to disapprove or reject. In this there is no relation between the two measured groups. So when the mean biomass will be equal in both monoculture and polyculture then they both will cancel out each other and this will be a null hypothesis. Since if each of the species group has equal mean values of biomass then they will cancel or nullify each other and a proper P value cannot be obtained.

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