Learning objective

By the end of this topic, you should :

• To be able to use the appropriate graphical display for the data type: scatter diagram, line graph, pie chart, bar chart, pareto diagram, histogram, ogive.

• To be able to construct stem-and-leaf plots and obtain the 5 figure summary

• To understand the difference between frequency, relative frequency and cumulative frequency in tables and plots

• To use software to produce accurate and informative graphs

Sources of error in samples and surveys