A scientist suspects that a certain lake has become polluted in the years since a dairy farm was built along its shores. To confirm her suspicions, the scientist performs several tests on the lakes water. The tests reveal that since the farm was built, the lakes dissolved oxygen levels have nearly doubled; tests also reveal the presence of E. Coli in the water. Do these data confirm the scientists suspicions that the lake is polluted? Explain your answer. Explain how the dairy farm could be responsible for each change measured by the scientist.