RIC-1069 Maths terms and tables
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Data representation<br />
Frequency polygon<br />
Also called a cumulative frequency polygon <strong>and</strong> formed by joining the<br />
midpoints of the tops of the bars of a histogram by line segments, which are<br />
connected at the start <strong>and</strong> finish of the graph to produce a polygon, with<br />
the area of the polygon being the same as the combined area of the bars,<br />
where the bars are of equal width.<br />
Line graph<br />
Formed by line segments connecting points representing certain data, <strong>and</strong><br />
with the horizontal axis usually indicating a measure of time; normally used<br />
for continuous or measurement data. Values can only be read accurately<br />
from the marked points, although estimates can be made from other<br />
positions along the line segments (interpolation); or beyond the points<br />
(extrapolation), which is more speculative. [See Cumulative frequency<br />
graph <strong>and</strong> Frequency polygon as special cases of line graphs.]<br />
e.g.<br />
82 <strong>Maths</strong> <strong>terms</strong> <strong>and</strong> <strong>tables</strong> R.I.C. Publications ® www.ricpublications.com.au
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