stem and leaf plot

http://www.mathsisfun.com/data/stem-leaf-plots.html

These tables are meant for large amounts of data. Numbers are split into a stem (the first number of a digit) and leaf (the remaining digits). This stem and leaf plot splits the digits like 15 and 16 into 1 which is the stem and 5 and 6 which are the leaves.

Histogram

http://www.math.kent.edu/~honli/teaching/statistics/Chapter2/Excell_Histogram.html

A histogram is a bar graph that has the data of frequency for the variable vertically and the classes to which the variable has been divided into is visible horizontally, with the width of each bar. The graph above shows the classes with respect to height in inches, while the frequency is visible on the left, vertical side of the graph. The graph shows a study done by UVM in order to see the frequency of height among 25 students. 

univariate choropleth map

http://www.colocarto.com/custom-thematic-maps.html

A univariate choropleth map displays data from a single variable with the use of shades from a single color. The map above has shades of orange-reddish to document the estimated household income of each state in the U.S. This is the only variable being displayed, and it is using shades from a single color to do so. 

Bivariate Choropleth Map

http://www.geog.ucsb.edu/~jeff/gis/choropleth_maps.html

A bivariate map shows two variables on a map with the use of color or patterns in order to differentiate between the two. The map above shows two different variables. The line pattern is show to represent the states that voted for Kerry and the ones that voted for Bush. The color is shown to represent the crime rate. The crime rate is classed with the different shades of color.

Unclassified choropleth map

http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo07.html

These maps are a bit biased in their display of data. Choropleth maps can easily be manipulated with too many classifications or not enough variation between shades of color. The map above has too many classes, and makes it difficult to fully understand the data visible on the map. 

Classed choropleth maps

http://eps.mq.edu.au/courses/GEOS219/choropleth.htm

These maps use classification intervals to categorize areas of certain data. In the map above, the Australian Bureau of Statistics has surveyed the amount of deaths per 1000 live births. The classifications have been divided into six classes. 

Range graded proportional circle map

https://www.e-education.psu.edu/geog486/book/export/html/1796

These maps use circles to show density of regions on a map. The particular map above shows a range of deaths for each circle placed on the state of California.