biostatistics practice exam question

Experiment 1 Experiment 2 Experiment 1 Variable Eigenvector 1 birds 0.67 ants 0.13 C.4 L.4 bees 0.07 flowers 0.63 grasses 0.09 Poson. or o' Verience Explained O.E Experiment 2 Variable Eigenvector 1 wing length 0.49 leg length 0.37 body length 0.62 wing width 0.51 15 End and 4 5th weight 0.54 Figure: the results of eigen-analysis conducted in two different experiments. On the left, the distribution of eigenvalues for each experiment is shown, while the variable loadings for the first eigenvector are shown on the right. In which experiment (1 or 2) were the variables, on average, more strongly correlated? What information about each experiment supports your conclusion? (20 marks) Experiment 1 was an investigation of diversity of five different taxonomic groups from 83 sites in Brisbane. What does eigenvector 1 tell us about the diversity of birds and bees? (10 marks) Experiment 2 was an investigation into the characteristics of 55 different tropical bird species. Biologically, how would you interpret eigenvector 1 from this experiment? (10 marks)