Presenting data
Groups
Charts for categorical and discrete data
Frequency tables, then the charts drawn from them: bars, pictograms and pies.
Diagrams for grouped data
Both tiers: stem-and-leaf, frequency polygons and equal-width histograms.
Time series and scatter graphs
Paired values plotted: readings over time, or one measurement against another.
Using charts honestly
Matching diagram to data, and the tricks that make an honest data set lie.
Histograms, cumulative frequency and box plots
Higher tier: frequency density, cumulative frequency curves and box plots.