1. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Mean Median Mode

2. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Remember the key You can also have back-to-back stem and leaf diagrams

3. 10. Presenting and analysing data * Stem and leaf diagrams Remember the key You can also have back-to-back stem and leaf diagrams

4. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit The median is not influenced by extreme values

5. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Lower quartile (LQ): (n+1)/4 th value Median: (n+1)/2 th value Upper quartile (UQ): 3(n+1)/4 th value

6. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Range: Highest value – lowest value Interquartile range (IQR): UQ - LQ

7. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Use a table with a column for fx

8. 10. Presenting and analysing data * Averages from frequency distributions Use a table with a column for fx

9. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit

10. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Use a table with columns for mid-point and fm

11. 10. Presenting and analysing data * Averages from grouped data Use a table with columns for mid-point and fm

12. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit A moving average ‘smooths out’ the data to show the underlying trend

13. 10. Presenting and analysing data * Moving averages A moving average ‘smooths out’ the data to show the underlying trend

14. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit A scatter diagram is used to see if two sets of data are related

15. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit Positive correlation Zero correlation Negative correlation

16. 10. Presenting and analysing data * Correlation and lines of best fit Positive correlation Zero correlation Negative correlation

17. 10. Presenting and analysing data * Averages for discrete data * Stem and leaf diagrams * Using appropriate averages * The quartiles * Measures of spread * Averages from frequency distributions * Spread from frequency distributions * Averages from grouped data * Moving averages * Scatter diagrams * Correlation and lines of best fit