Reading a Box and Whisker Plot
Step 1: Compare The Medians of Box PlotsStep 2: Compare The Interquartile Ranges and Whiskers of Box PlotsStep 3: Look For Potential OutliersCompare the interquartile ranges (that is, the box lengths) to examine how the data is dispersed between each sample. The longer the box, the more dispersed the data. The smaller, the less dispersed the data. Next, look at the overall spread as shown by the extreme values at the end of two whiskers. This shows the range of scores (another type of d...See more on simplypsychology metricgate
How to Interpret a Boxplot - MetricGate
The width of the box (the IQR) is the most robust measure of spread. A wide box means high variability in the central portion of the data; a narrow box means the middle values are tightly clustered.