4. You are a public health nurse working for the City of Hamilton Public Health Department. concerned about pesticide exposure in rural residents. You have conducted a study to me pesticide residue levels (ppb) in blood samples from 11 residents in four rural areas in Har you think differ in exposure to pesticides. The 11 residents in each of the areas are unrelat another. You have obtained the following results: Area A (pesticide Area B (pesticide Area C (pesticide Area D (pestio residue level, ppb) residue level, ppb) residue level, ppb) residue level, 10 4 15 7 37 35 5 11 12 32 10 10 44 11 9 4 12 7 11 15 32 9 2 31 19 12 8 11 33 6 9 18 42 17 14 23 8 15 Answer the following questions using these data. (i) You know from previous studies that pesticide residue levels are typically positive You decide that nonparametric methods would be more appropriate to explore di