## GRAPH

Posted January 22, 2010 by edtech2a11
Categories: Uncategorized

Graph:

• a visual representation of the relations between certain

quantities plotted with reference to a set of axes.

• A graph is an image or chart representation

used to show a numerical relationship.

• A pictorial representation of information or

relationships between numbers.

• A complete, labeled, graphical

representation of some data sets.
Graphs are pictures that help us understand amounts.
These amounts are called data. There are many kinds of graphs,
each having special parts.

Kinds of graph:

A circle graph is shaped like a circle.
It is divided into fractions that look like pieces of pie,
so sometimes a circle graph is called a pie graph.
Many times the fractional parts are different colors and
a key explains the colors.  ### Advantages: – Excellent for data comparison (esp. vertical bar graphs) – Labelling for clarification possible with horizontal bar graphs – Clearly show error values in the data – Usually simple to read and understand Disadvantages: – Can be tempting to compare too many things, graph becomes convoluted and difficult to understand – Limited space for labelling with vertical bar graphs A bar graph uses bars to show data. The bars can be vertical (up and down), or horizontal (across). The data can be in words or numbers.

```  A picture graph uses pictures or symbols to show data.
One picture often stands for more than one vote so a

key is necessary to understand the symbols.   ```

A histogram is a special kind of bar graph.
The data must be shown as numbers in order.

```  ```
 ```A line graph shows points plotted on a graph. The points are then ``` ```connected to form a line.   ``` ` `
``` ```