I am comparing 2 variables and have an outlier in x of 82.27. I want to find the z score of this outlier. When using the z score equation x-mean/standard deviation, do I use the mean and standard deviation of my x values or y values?
2026-03-30 16:42:49.1774888969
z-score equation variables
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If the observation of 82.27 belongs to the variable $x$, then we use the mean and standard deviation for $x$ to find the $z$-score: $$z=\frac{x-\mu_x}{\sigma_x}=\frac{82.27-\mu_x}{\sigma_x}$$