In a box plot, it is easy to see the range of where 50% of your data lies. Let’s examine this a little further by describing the interquartile range. Quartiles can be defined as dividing your data ...

However, the trimmed mean does not have a normal distribution even if the data are normally distributed. The interquartile range (IQR) is simply the difference ... Rousseeuw and Croux (1993) proposed ...