Go to finance.yahoo.com and download five years of monthly closing prices for Eli Lilly (ticker = LLY), Alcoa (AA), and the S&P 500 Index (GSPC). Download the data into an Excel file and use the Adjusted-Close prices, which adjust for dividend payments, to calculate the monthly rate of return for each price series. Use an XY scatter plot chart with no line joining the points to plot Alcoas returns against the S&P 500. Now select one of the data points, and right-click to obtain a shortcut menu allowing you to enter a trend line. This is Alcoas characteristic line, and the slope is Alcoas beta. Repeat this process for Lilly. What conclusions can you draw from each companys characteristic line?