Reasoning with data

Overview

Much of the statistics content in Key Stage 3 is a continuation of that studied at
primary school, and many of the charts and graphs in this half term have been
used in Year 7 and earlier in Year 8. A particular focus is using charts to
compare different distributions. We also explore when graphs may be
misleading, an important real-life consideration. Collection of data is also
covered, including designing and criticising questionnaires.

Students have already met the median and the mean earlier in KS3. This half term
reintroduces the mode and also looks at when and why each average should be
used. Students will also look at the mean from grouped
and ungrouped frequency tables. We also consider outliers, considering what effect
these have on all the measures studied, and whether they should be included or
excluded in our calculations.

Lesson 1 – Working with Questionnaires

Lesson 2 – Pictograms

Lesson – Bar charts

Lesson 3 – Pie Charts (New for 2024 – 25)

Lesson 4 – Which statistical diagram is best?

Lesson 5 – Misleading Graphs

Lesson 6 – Working with the range

Lesson 7 – Mean, mode and median

Lesson 8 – Which average should we use?

Lesson 9 – Outliers

Lesson 10 – Averages from frequency tables

Lesson 11 – Averages from grouped frequency tables

Lesson 12 – Comparing data sets