A large batch of soil samples was analysed to determine presence of certain polluting agents. For each sample, the quantity of certain pollutant elements was determined and afterwards, Principal Component Analysis was performed with these data. The following is the loadings matrix. PC2 Potasium Iron Magnesium Cadmium PC1 PC3 PC4 0.03967 -0.06958 -0.01218 -0.99671 0.79202 -0.01139 -0.60909 0.03976 -0.4302 -0.71979 -0.54336 0.03976 -0.43133 0.6906 -0.5776 -0.05832 Match each component with its interpretation. PC4 Choose... PC1 Choose... PC2 Choose... PC3 A contrast between Iron and the average of Magnesium and Cadmium Mostly variable Potasium A (weighted) average of variables Magnesium, Cadmium, Iron A contrast (comparison) between Magnesium and Cadmium

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