This powerpoint with a number of examples of each topic lasted for a 1.5 hour lesson.Plenty of practical graph drawing. Some of the custom builds don't work on slideshare

1. Averages and dispersion

4. Where is mean? Where is median? There is a way of showing a difference…

6. Fairly spread out distribution – Higher IQR More spread out data More compact distribution Lower IQR, less spread out data, more consistent

7. Wide dispersion, more variation, less consistent Narrow dispersion, less variation, more consistent Same mean mode median Different dispersions

8. Mean from distribution Total gives number of people Total of this column gives an estimate of total height… 12 155-159 8 150-154 441 3 147 145-149 X × F F X Group

9. Mean formula “ Sum of the x times the f” “ Sum of fs” The mean symbol

10. Cumulative frequency table Each figure in this column is the sum of the frequencies up to that line Must use the UCB here – NOT the midpoint 12 155-159 11 8 154.5 150-154 3 3 149.5 145-149 CF F UCB Group

13. Median…. Upper Quartile (UQ)‏ Lower Quartile (LQ)‏

15. Box and whisker plot Median Drawn on same set of axes – really good Comparison of two frequency tables… Max Min LQ UQ