Answer :
An outlier is an observation that differs significantly in magnitude from the other observations for a certain variable. A data point that differs significantly from other observations is referred to as an outlier.
An outlier could be the result of measurement variability or it could be an indication of experimental error; the latter is sometimes removed from the data set. The greatest size and direction of an object are referred to as its magnitude. In both vector and scalar quantities, magnitude is a common factor. We know that scalar quantities are those that have magnitude and nothing else by definition. Statistical analysis can suffer greatly from an outlier.
Although outliers can happen randomly in any distribution, they frequently point to either measurement error or the population.
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