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Problem 11-11 Suppose that, after conducting an analysis of past stock prices, you come up with the following observations. Which would appear to contradict the weak form of the efficient market hypothesls? O The average rate of return Is significantly greater than zero. The correlation between the return during a given week and the return during the following week Is zero. One could have made superior returns by buying stock after a 10% rise in price and selling after a 10% fall. One could have made higher-than-average capltal galns by holding stocks with low dividend ylelds