Statistics – Diagrams

There are several Statistics diagrams you should be familiar with. You could use Mr Barton’s notes on Statistics to remind you of the theory.

There are also several useful sites you could use.

Use this applet from the National Library of Virtual Manipulatives to easily create a pi chart. Simply enter your data and choose ‘Draw Chart’.
The library has many other applets for Data Analysis and Probability

Mathisfun: Data Graphs
Suppose we wish to illustrate the following data.
Sally counted the number of vehicles that passed her house during one hour.

Type of Vehicle Number of Vehicles
Car 24
Van 8
Bus 3
Lorry 5

Enter the number of values and the height required on the y axis.
Enter the labels (car, van etc)
Click on the graph at the required height for each.
Alternatively you can select Table and enter your data.
Note that you can choose the display type, eg you could change to a pie chart.
You can print your chart.

WaldoMaths
There are applets for Statistical Diagrams on WaldoMaths.
The Scatter Diagrams applet allows you to plot some points and then draw what you think is the line of best fit. You can compare your effort with an accurate line of best fit drawn by the computer!

You can also try the Cumulative Frequency applet which illustrates cumulative frequency, box plots and also frequency polygons.

To see why we use histograms for unequal class intervals explore the Histograms applet.

From easycalculation.com try this online stem and leaf plotter. Simply type in your data and select ‘compute’.

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