Both ends of the the box (the "whiskers") plot determine the range of your data, without including outliers. (Outliers are marked by an asterisk). The end of the left side of the box is the lower quartile. The line in the box is the median. The other end of the box represent the upper quartile.
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box and whiskers graph
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Expressing statistical data
A distribution function or a cumulative distribution function. The spread and range are also immediately apparent from a box [and whiskers] plot.
A box and whisker plot may not have whiskers if all the data points fall within the interquartile range (IQR), resulting in no values outside this range. This can occur in a dataset where all values are identical or very closely clustered within the quartiles. Additionally, if there are outliers that are significantly distant from the rest of the data, the whiskers may extend only to the closest non-outlier values, potentially leading to situations where one or both whiskers are absent.