With an even-numbered data set, the median is the mean of the two values in the middle, so you simply divide your data set into two halves. Step 2: Locate the median, and then separate the values below it from the values above it. Step 1: Order your values from low to high. We’ll walk through four steps using a sample data set with 10 values. To see how the exclusive method works by hand, we’ll use two examples: one with an even number of data points, and one with an odd number. The exclusive interquartile range may be more appropriate for large samples, while for small samples, the inclusive interquartile range may be more representative because it’s a narrower range. While there is little consensus on the best method for finding the interquartile range, the exclusive interquartile range is always larger than the inclusive interquartile range. It’s more common to use the exclusive method in this case.
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