Ononot — We have two variables, X and Y, measured on the same 10 subj

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Descriptive Statisticshard

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We have two variables, $X$ and $Y$ , measured on the same 10 subjects. If $Y_i = 2X_i + 5$ for all $i$ , and the sample variance of $X$ is $s_X^2 = 12$ , what is the sample variance of the difference variable $D = Y - X$ ?