For M, the covariance between H and I was computed as 45%% in Formula 8.9. The variance

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For M, the covariance between H and I was computed as 45%% in Formula 8.9. The variance of H is 90%% (from Table 8.4 on page 232), the variance of I is 189%% (from the same figure). Therefore, using the shortcut Formula 8.10, Var(˜rM) = (2/3)2 . 90%% + (1/3)2 . 189%% + 2 . (2/3) . (1/3) . 45%% =

81%%.

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