(11(23 marks) A study was conducted to investigate the concentration of hydrophobic organic substances such as Aldrin in the Wolf River in Tennessee. Aldrin concertation measurements (in nanograms per litre) we re taken downstream of an abandoned dump site that had previously been used by the pesticide industry to dispose of its waste products. it was expected that Aldrin concentration might have a nonhomogeneous vertical distribution in the river because of differences in density between these compounds and water and because of the adsorption of these compounds on sediments, which could lead to higher concentrations on the bottom. As a results water samples from surface, mid depth and bottom of the river were collected at random and measured for Aldrin concentration. The following data were obtained: Mid-depth Bottom 5.17 4.81 6.17 5.71 6.26 4.9 4.26 5.35 3.17 5.26 3.76 6.26 4.76 3.76 4.9 8.07 6.57 8.79 5.17 7.3 At 5% level of significance, test for a difference in mean Aldrin concertation among the three depth levels; if there is a difference identify which depth levels have produced the difference