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What is the definition of covariance in words, according to the notes? Question 9 options: Average of (X deviation) * (Y deviation) Unit-free measurement of

What is the definition of covariance in words, according to the notes? Question 9 options: Average of (X deviation) * (Y deviation) Unit-free measurement of the strength of the linear relationship between two variables Correlation squared Proportion of variance in Y explained by the model with X

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