Definition: This is a value which is much greater than, or much less than, the other values. It is important because it can affect your measures of central tendency greatly.

Outliers

Explanation:

In statistics, such as stratified samples, an outlier is an observation that is numerically distant from the rest of the data. Statistics derived from data sets that include outliers will often be misleading.

Outliers are sometimes a subjective matter, and there are numerous methods to classify them. The method most taught academically due to its simplicity and results is the Tukey test.

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