Problem 26-16
The following is part of the computer output from a regression of monthly returns on Waterworks stock against the S&P 500 ind ex. A hedge
fund manager believes that Waterworks is underpriced, with an alpha of 2% over the coming month.
Standard Deviation Beta R-squareof Residuals
0.65 0.75 0.06 (i.e., 6% monthly)
Now suppose that the manager misestimates the beta of Waterworks stock, believing it to be 0.50 instead of 0.75. The standard deviation of
the monthly market rate of return is 5%.
a.What is the standard deviation of the (now improperly) hedged portfolio? (Round your answer to 3 decimal places. Omit the “%” sign in
your response.)
Standard deviation %
b.What is the probability of incurring a loss on improperly hedged portfolioover the next month if the monthly market return has an
Probability of a negative return %
c.What would be the probability of a loss you if hold an equally weighted portfolio of 100 stocks with the same alpha, beta, and residual