Four samples of water were taken at five different locations along a river and measurements were obtained of the amount of E. Coli colonies within the water as given in DS 11.1.9. Investigate whether there is any evidence that the E. Coli pollution levels are different at the five locations. Make a graphical presentation that illustrates the differences between the E. Coli levels at the five locations. Which location has the highest E. Coli level? Which location has the smallest E. Coli level?