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Aitchison College Academic Resources.
9 Statistics (continued)
—9.5 Scatter diagrams
1 Drow and interpret soatter diagrams.
2 Understand what is meant by positive, negative
and zero correlation.
3 Draw by eye, interpret and use a straight line of
best fit.
Fiotted points should be oloarty martied, for
example as small crosses (x).
Aline of best fit:
should be a single ruled line drawn by
inspection
should extend across the full data set
does not need to coincide exactly with any of
the points but there should be a roughly even
distribution of points either side of the ine over
its entire length.
Notes and examples
Plotted points on a cumulative frequency diagram
should be clearly marked, for example as smal
crosses (x), and be joined with a smooth curve.
Notes and examples
On histograms, the vertical axis is labelled
“Frequency density’.
Frequency density is defined as
frequency density = frequency > class width.
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