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Random Variable: A numerical function of a random sample, a statistic.\nExpectation: Weighted average of the values of X, where the weights are the probabilities of the values\nVariance: Expected squared deviation from the expectation of X, the units of variances are the units of X squared.

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Interpretation of Variance

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Linear Transformations

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Standardization of random variables

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Variance of a sum -> Covariance

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I.I.D. sample sum

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Model Risk

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Bias and Overfitting

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Questions

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