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How to Calculate Outliers.
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How to Calculate Outliers.

Rosemary Njeri

In statistics, an outlier is a data point that differs significantly from other observations.

An outlier may be due to variability in the measurement or it may indicate experimental error.

Formula to calculate outlier.

For the higher outlier we use the following formula.

How to Calculate Outliers.

For the lower outlier we use;

How to Calculate Outliers.

Q1 is the lower quartile.

Q3 is the upper quartile.

IQR is the interquartile range.

Example:

Suppose you had a data set and you calculated your lower quartile to be 5 and your upper quartile to be 60. If your interquartile range is 55, calculate your lower outliers.

How to Calculate Outliers.

Therefore, your lower outlier is -77.5.

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