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Graphs and plots

Graphs and plots

This page covers the following topics:

Time series graphs are used to represent data collected over time.

Time series

Scatter graphs use a line of best fit, drawn centrally through the points, to show correlations between variables; extend the line to extrapolate (estimate) values outside the range of data given.

Scatter graphs

Box plots visually display the median, quartiles and interquartile range of a data set against a scale.

Box plots

Pictograms display data using symbols that makes information visually easier to understand and uses a key to show what each symbol presents. Below is an example displaying the number of cupcakes sold each day at a cafe.

Pictograms

Histograms are used when class intervals are unequal. Frequency is represented by the area of the bar; the height of each bar is called the frequency density and there are no gaps between the bars.

Histograms

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