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9.7: Variance Sum Law II - Correlated Variables
https://stats.libretexts.org/Courses/Luther_College/Psyc_350%3ABehavioral_Statistics_(Toussaint)/09%3A_Describing_Bivariate_Data/9.07%3A_Variance_Sum_Law_II_-_Correlated_Variables
When variables are correlated, the variance of the sum or difference includes a correlation factor.
4.7: Variance Sum Law II - Correlated Variables
https://stats.libretexts.org/Bookshelves/Introductory_Statistics/Introductory_Statistics_(Lane)/04%3A_Describing_Bivariate_Data/4.07%3A_Variance_Sum_Law_II_-_Correlated_Variables
When variables are correlated, the variance of the sum or difference includes a correlation factor.

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