AT&T Microsoft Expected Return Standard Deviation 0.10 0.15 0.21 0.25 What is the minimum-risk (standard deviation) portfolio of AT&T and Microsoft if - the correlation between the two stocks is 0? 0.5? 1?-1? What do you notice about the change in the allocations between AT&T and Microsoft as the correlation coefficient moves from - 1 to 0? to 0.5? to +1? Why might this be? What is the standard deviation of each of these minimum-risk portfolios