4 . Two investment advisers are comparing performance. One averaged a 19% return and the other a 16% return. However, a. Can you tell which adviser was a better selector of individual stocks (aside from the issue of general movements in the market)? b. If the T-bill rate were 6% and the market return during the period were 14%, which adviser would appear to be the superior stock selector? c. What if the T-bill rate were 3% and the market return 15%