This vertical bar chart has 4 columns of varying height. The horizontal axis has no label and just shows each column labelled with a, b, c and d from left to right. The vertical axis is not labelled and has no units, but the scale goes from 0 to 300 in divisions of 50. The heights of the columns cannot be read accurately but are at approximately the following heights on the vertical axis:

• a 235
• b 255
• c 270
• d 240

The overall impression is of quite small variation in bar heights.

3.2 Cheating with bar charts