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Outliers are extreme values that significantly differ from other values in a dataset. They can greatly affect statistical analyses and should be carefully examined.
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Quartiles: Quartiles divide data into four equal parts and can help identify outliers using interquartile range.
Boxplot: A boxplot is a graphical representation of data that shows outliers as individual points outside the main distribution.
Z-Score: A z-score measures how many standard deviations an observation is from the mean and can help identify outliers.