2. Download to a spreadsheet the last five years of monthly adjusted stock prices for each of the companies in Table 7.5 and for the Standard & Poor's Composite Index (S&P 500). a. Calculate the monthly returns. b. Calculate beta for each stock using the Excel function SLOPE, where the y range refers to the stock return (the dependent variable) and the * range is the market return (the independent variable). c. How have the betas changed from those reported in Table 7.5? Some of have increased and some decreased