Were the levels of naphthalene different in the sediment near Alabama and Florida? Following the Deepwater Horizon oil spill in 2012, the EPA measured the amount of naphthalene in the sediment at various locations in the Gulf of Mexico. A random sample of these short-term measurements near Florida and Alabama was obtained from the EPA. The data are given in the following table.
Use the Wilcoxon rank-sum test to determine whether there is any evidence to suggest a difference in the concentration of naphthalene in the sediment near Alabama and Florida. Use a = 0.05.