There are various clues that can lead to questioning the accuracy of a graphical representation.
The scale on the horizontal axis may have the units unevenly spaced or the vertical axis may not start at 0 when recording frequency.
In some graphs, the area of bars may be meant to represent frequency but may not be proportional to the frequency represented in different bars.
In pie charts, where the circle is meant to represent 100% of the data, the segments of the pie may be incorrectly labelled and not add up to 100%.
