15. Lyndon Station stock has a beta of 1.20. Over five years, the following returns were produced by Lyndon stock and a market index. Assuming a market model intercept term of 0%, calculate the standard deviation of the market model random error term over this period.

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Year Lyndon Return Market Index 1 17.2% 14.0% 2 -3.1 -3.0 3 19.9 10.0 4 28.5 25.0 5 9.8 8.0