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Students learn how to plot and interpret various statistical diagrams ranging from pie charts to histograms with unequal class widths. 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 3 and is followed by calculating statistical measures such as averages and range.

- Interpret and construct:
- frequency tables
- bar charts
- pictograms

- for categorical data.
- Construct and interpret stem and leaf diagrams
- Apply statistics to describe a population

- Infer properties of populations or distributions from a sample, whilst knowing the limitations of sampling
- Interpret and construct tables and line graphs for time series data and know their appropriate useconstruct and interpret diagrams for grouped discrete data and continuous data, i.e. histograms with equal and unequal class intervals and cumulative frequency graphs, and know their appropriate use.

- Students need to spend time interpreting the diagrams as well as creating them.
- When using pie charts to compare distributions the frequency of corresponding sectors is dependent on the total sample size.
- Frequency diagrams are used to represent discrete data whereas histograms are used for continuous data.
- Histograms with unequal class widths represent data with an unequal spread. Frequency is found using the area of a bar rather than its height.
- Cumulative frequency is the running total of the frequency.
- The interquartile range (IQR) shows the boundaries of where the most representative data is located.

- Histograms are often confused with frequency diagrams.
- Students tend to be more competent with constructing the various representations than using them to analyse and make summative comments about distributions.

January 13, 2020

To find the area of compound shapes students need to understand what the word compound means. Therefore, I ask students to discuss in pairs a definition for the word compound and to extend it to include the shapes below. As a result of their learning in science students agree that a compound can be defined […]

January 4, 2020

At the start of the Spring Term these are three main priorities for me as the Head of Mathematics.

January 1, 2020

I teach mutually exclusive outcomes directly after students have encountered Venn diagrams. This is the fifth Year 8 Probability lesson.