Identify whether there is a residual outlier from a list of residuals
Problem
These labeled residuals are given: \(A\): \(1\), \(B\): \(-2\), \(C\): \(15\), \(D\): \(0\). Is there a residual outlier?
Big Picture
What this problem is really about
A residual outlier is separated by error magnitude, not by sign or list position. Keep each label attached to its residual, compare absolute distances from zero, and identify whether one magnitude stands far apart from the cluster formed by the others.
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