Charts and Graphs

 Why Use Charts or Graphs: A page full of numbers is very hard to understand. But if you put those same numbers on the right kind of chart, they become very easy to understand. There are many kinds of charts such as bar chart, pie chart and line graph. Think of a chart as your presentation or final report showing all the work you have done. To make your experiment results more understandable, use your data tables to make graphs or charts.  When do I make a line graph? You make a line graph in order to show the relation between two variables while the values for both variables are numeric and changes are continuous. For example you may be studying the speed of wind in different heights from 1 meter up to 150 meters.  A company that makes wind turbine, may want to know what is the best height for a wind turbine in a certain area. Your results table have two columns. One is the height and the other is the wind speed. Both of these two values are numeric and the changes are continuous. When do I make a bar chart? You make a bar chart in order to show the relation between two variables when the values for one variable are numbers and the values for the other variable are names. For example if you are studying on the density of different material, then your results table has two columns. One column contains the name of material (wood, Iron, plastic, glass,..) and the other column contains the density of such material (that is a number). Related topics: Go Back