Comparing Data


two types of statistical graphs which are useful for recording and then comparing more than one set of data are the stem and leaf diagram and the box and whisker plot or diagram.

the stem and leaf graph allows easy recording and display of data in order, and the box and whisker diagram is useful for comparing the spreads of two or more sets of data.

Key Skills

  • sort and display data using a stem and leaf graph.
  • find the median and quartiles from a stem and leaf graph
  • display the features of sets of data on a box and whisker diagram
  • read information about a set of data from a box and whisker diagram


box and whisker diagram, stem and leaf diagrammedianlower quartileupper quartile, quartilefrequencydigit.