An outlier is a data value that has a z-score less than -1.5 or is greater than Q3-1.5*IQR.

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An outlier is typically defined as a data value that is significantly different from other data points in a dataset. The common criteria for identifying outliers include having a z-score less than -3 or greater than 3, or being outside the range defined by Q1-1.5*IQR and Q3+1.5*IQR, where Q1 and Q3 are the first and third quartiles, respectively, and IQR is the interquartile range.

An Outlier Is a Data Value That Has a Z-Score