Dot Plots

Dot Plots are one way to visually represent quantitative data. Dot plots are created by placing a dot on a graph everytime a value happens. Take for example the following dataset:

Dot Plot - 1.png

To create a dot plot, we put the numbers 1 – 10 along the x-axis. Then you take the first number in the dataset, which is a 3, and place a dot above the three:

Dot Plot - 3.png

Then you take the next number in the dataset, which is a 2 and put a dot above the 2.

Dot Plot - 4.png

The next point in the dataset is another 2, so we place a dot above the dot above the first dot.

Dot Plot - 5.png

We continue adding dots for every point in the dataset until we have all of the data points are on the graph. The completed dot plot is shown below:

Dot Plot - 2.png

 

Dot Plots are an excellent way to display quantitative data that has a small amount of variability. Because the higher the variability in the dataset the more spread out the data is, and therefore the shorter each of the bars is.