c. Assume that you have decided to invest one-half of your money in Wal-Mart and the remainder in Target. Calculate the monthly holding-period returns for your two-stock portfolio. (The monthly return for the portfolio is the average of the two stocks monthly returns.) Plot the returns of your two-stock portfolio against the Standard & Poors 500 Index as you did for the individual stocks in part b. How does this graph compare to the graphs for the individual stocks? Explain the difference.

The data below presents monthly closing prices of Standard & Poor's 500 Index, Wal-Mart, and Target to calculate the holding-period returns for the 24 months from May 2011 through May 2013 Month S&P500 Walmart Target 2011 1.631 2012 May June July August September October November December January February March April May June July August September October November December January February March April May 1.606 1.684 1.633 1.682 1.757 1.806 1.848 1.783 1.859 1.872 1.884 1.924 1.960 1.931 2.003 1.972 2.018 2.068 2.059 1.995 2.105 2.068 2.086 2.182 74,84 74,49 77,94 72,98 73,96 76,75 81,01 78,69 74,68 74,70 76,43 79,71 76,77 75,07 73,58 75,50 76,47 76,27 87,54 85,88 84,98 83,93 82,25 78,05 75,86 69,50 68,86 71,25 63,31 63,98 64,79 63,93 63,27 56,64 62,54 60,51 61,75 56,76 57,95 59,59 60,07 62,68 61,82 74,00 75,91 73,61 76,83 82,07 78,83 79,29 2013