# Introduction to Graphs

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Graphical representation of data is easier to understand.
- A bar graph is used to show comparison among categories.
- A pie chart is used to compare parts of a whole.
- A Histogram is a bar graph that shows data in intervals.

A line graph which is a whole unbroken line is called a linear graph.
For fixing a point on the graph sheet we need, x-coordinate and y-coordinate.

The relation between dependent variable and independent variable is shown through a graph.
Co-ordinates are pairs of numbers that are used to determine points in a plane, relative to a special point called the origin. The origin has co-ordinates (0,0). Any other point in the plane has a pair of co-ordinates (x, y).

Collection of information in raw form in order to reveal useful results is called data. Data can be a number, word or symbol.
The dependent variables are those that are observed to change in response to the independent variables.
When a line graph represented as a whole unbroken line, it is called a linear graph.
A line graph displays data that changes continuously over period of time. Solid points are plotted to represent the data.

A histogram is constructed from a frequency table. The intervals are shown on the x-axis and the number of scores in each interval is represented by the height of a rectangle located above the interval.
A double bar graph shows two sets of data simultaneously. It is used for the comparison of the data.

Bar graph is a pictorial representation of numerical data by a number of bars of uniform width placed vertically or horizontally with an equal spacing between them.

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