We are interested in determining whether the position of Coca-Cola in a store affects sales. Specifically, does Coke sell better when it is placed in the front or middle of an aisle? The file P10_62.XLS contains sales of Coke at 10 stores when Coke was placed in the front of an aisle and at another 10 stores when Coke was placed in the back of an aisle. What are reasonable null and alternative hypotheses to test? Use the data to test them. What can you conclude?