Dotplot

A dotplot places every data value as a dot over its position on a number line, stacking repeats. For example, the values 3, 3, 4, and 6 would show two dots above 3 and one dot each above 4 and 6. Because each dot is one observation, you can read off the shape, center, and any gaps or outliers directly. Dotplots work best for small data sets.