Data that is collected over a period of time is called time series data.
A series of seconds, minutes, hours, days, weeks, months, quarters or
perhaps number of years may represent time. Often, we draw graphs of time
series data as line graphs that can be used to make predictions and draw
conclusions.
Example 14
Draw a time series graph of the daily amount of rainfall (in
millimetres) based on the following recorded data.

Solution:
The time series graph is obtained by plotting y against t,
as shown below.
Key Terms
time series, time
series data, line graph, time
series graph
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