Statistical Diagrams

Students learn how to plot and interpret various statistical diagrams ranging from pictograms and barcharts to frequency polygons and time series.  Throughout the unit emphasis is place on interpreting the diagrams as much as it is plotting them.

This unit takes place in Year 9 Term 1 and is followed by calculating statistical measures such as averages and range.


Statistical Diagrams Lessons
Prerequisite Knowledge
  • solve comparison, sum and difference problems using information presented in a line graph
  • complete, read and interpret information in tables, including timetables.
Success Criteria

interpret and construct

  • frequency tables
  • bar charts
  • pie charts
  • pictograms
  • pie charts

for categorical data.

  • interpret and construct
  • vertical line charts for ungrouped discrete numerical data
  • tables and line graphs for time series data

and know their appropriate use.

Key Concepts
  • Frequency tables must not have overlapping categories
  • Diagrams must not imply bias (e.g., equal width bar charts0
  • Pictograms need to use suitable symbols to illustrate fractional amounts
  • Students need to spend time interpreting the diagrams as well as creating them.
Common Misconceptions
  • Bar charts are often drawn with unequal width bars.
  • Students often use nonlinear scales for bar and line graphs.
  • The frequency is often incorrectly taken as the angle when drawing pie charts.
  • Diagrams are often drawn without the correct labels and missing titl

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes:

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Mr Mathematics Blog

Literacy in Mathematics – Creating Problem Solvers

Last year my school had a OFSTED trial inspection. Whilst the maths team recieved favourable feedback the inspectors noted a need for a focus on whole school literacy. Because of this I was asked to demonstrate how we develop student’s literacy in mathematics. Literacy in Mathematics By developing student’s literacy in mathematics we aim to […]

Angles in Polygons

There are two key learning points when solving problems with angles in polygons.  The first is to understand why all the exterior angles of a polygon have a sum of 360°.  The second is to understand the interior and exterior angles appear on the same straight line. Students can be told these two facts and […]

Getting Ready for a New School Year

When getting ready for a new school year I have a list of priorities to work through. Knowing my team have all the information and resources they need to teach their students gives me confidence we will start the term in the best possible way.  Mathematics Teaching and Learning Folder All teachers receive a folder […]