Statistical Presentation Of Data | Bar Graph | Pie Graph | Line Graph | Example

For easy understanding the variations in data. After the collection and tabulation of data, it can be represented by a graph. Most common graphs are

  1. Bar graphs
  2. Pie graphs
  3. Line graphs

Bar Graph

Bar graph represents the relation between class interval/group and frequency of that particular class interval.

  • Along x-axis is the class distribution and along y-axis is the number of times same event repeats and it is named as frequency of that class/group.

Statistical Presentation Of Data

Pie Graph

It is a circular chart that is divided into a number of sectors. For representing data in a pie graph, circle is divided into sectors.

Example

The number of bedrooms on each floor of a 15 storey building is given as:

1 2 4 3 2 5 6 5 4 5 2 5 6 6 3

Solution

Pie Graph Example

For pie graph presentation, divide 360 degrees by 15. Because 360 is an angle of a full circle.

360/15 = 24 degrees

  • For 1-bedroom sector = 1*24 = 24 degrees
  • For 2-bedrooms sector = 3*24 = 72 degrees
  • For 3-bedrooms sector = 2*24 = 48 degrees
  • For 4-bedrooms sector = 2*24 =48 degrees
  • For 5-bedrooms sector =4*24 =96 degrees
  • For 6-bedrooms sector = 3*24 =72 degrees
  • By adding all the sector angle = 360 degrees

Graphically…

Pie Graph For Presentation Of Data

Line Graph

The simplest type of graphs is the line graph. Most commonly used when given data is in the form of grouped frequency.

Along x-axis is the group number and along y-axis is the frequency with respect to each separate group.

Statistical Presentation Of data "Line Graph"