A bar graph is used to display the frequency of data in categories , using vertical or horizontal bars. You can easily compare the categories using a bar graph. The bar graph below shows the incarceration rates of different countries. Prisoners per of the population of the country( ).
Line graphs usually show how values change over a period of time . A line graph displays data using line segments.
The line graph below shows the daily high temperature of Placerville , California recorded over a week.
Circle graph is used to compare parts of the data to the whole . The entire circle represents of the data and each sector represents a percent of the total.
The circle graph below shows the results of a survey that asked teen hobbies, ages to .